WO2017047374A1 - イオン選択電極、その作製方法及びカートリッジ - Google Patents
イオン選択電極、その作製方法及びカートリッジ Download PDFInfo
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- WO2017047374A1 WO2017047374A1 PCT/JP2016/075291 JP2016075291W WO2017047374A1 WO 2017047374 A1 WO2017047374 A1 WO 2017047374A1 JP 2016075291 W JP2016075291 W JP 2016075291W WO 2017047374 A1 WO2017047374 A1 WO 2017047374A1
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- storage material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/333—Ion-selective electrodes or membranes
- G01N27/3335—Ion-selective electrodes or membranes the membrane containing at least one organic component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/333—Ion-selective electrodes or membranes
Definitions
- the present invention relates to a solid contact ion selective electrode, a manufacturing method thereof, and a cartridge.
- the ion selective electrode is used in a wide range of fields such as living organisms, medical use, and the environment because it easily generates an electromotive force according to the concentration of ions to be measured simply by contacting the sample solution together with the reference electrode.
- blood ion concentrations are important from a medical point of view, so millions of blood sodium, potassium, and chlorine are measured each year. These measurements are performed using small devices in clinics and clinics as well as large inspection devices in hospitals and inspection centers.
- the solid-contact ion-selective electrode (SC-ISE; Solid-contaction-selective-electrode ) Is often used.
- SC-ISE Solid-contaction-selective-electrode
- the internal electrode a conductive polymer, carbon, an ion storage material, or the like is used. Examples of using ion storage materials are US 2004/0163949 A1, US IV 4,859,306.
- the ion selective electrode of the present invention uses an ion storage material that stores the ions to be measured as a base electrode. That is, the ion selective electrode of the present invention is an electrode that selectively detects ions to be measured in a sample solution, and the electrode is composed of a conductive wiring, a conductive electrode, an ion storage material layer, and an ion sensitive film.
- the ions to be measured are group 1 element ions, group 2 element ions, group 17 element ions, hydronium ions, or ammonium ions.
- the ion storage material layer is a porous coordination polymer.
- the step of producing a porous coordination polymer includes a step of mixing a solution A containing a transition metal M and a solution B containing a transition metal M ′, and a step of recovering the porous coordination polymer from a product resulting from the mixing.
- Transition metal M and transition metal M ′ are the same or different, at least solution A contains transition metal M having a different valence, and at least one of solution A and solution B contains an organic ligand.
- a process of producing an ion storage material layer a process of dispersing an ion storage material in a solution, a process of adding a redox material to a solution in which the ion storage material is dispersed, and an ion storage rate by adding a redox material. Recovering the adjusted ion storage material.
- the step of preparing the ion storage material layer includes a step of preparing a first ion storage material in which the ion storage rate of the target ions is the first value, and an ion storage rate of the target ions of the second value.
- the method includes a step of preparing a second ion storage material, and a step of mixing the first ion storage material and the second ion storage material.
- the ions to be measured become an electrochemical governing factor at the interface between the base electrode and the ion-sensitive film, and high potential stability is obtained. .
- the ion storage rate in the ion storage material before forming the base electrode high potential reproducibility can be obtained, and the potential predicted from the ion storage material and the ion storage rate can be obtained.
- Prussian blue analogs containing transition metals other than iron, such as nickel, cobalt, copper, silver, and cadmium in the ion storage layer, the ion storage rate can be easily adjusted.
- the flowchart which shows an example of the manufacturing process of an ion selective electrode.
- the figure which shows the example of the ion occlusion rate adjustment method of a porous coordination polymer The figure which shows the example of the cartridge with a flow path using the solid contact type ion selection electrode. Schematic which shows the example of the electrolyte concentration measuring apparatus using the cartridge with a flow path. The figure which compared and showed the absorption spectrum in the case of occlusion rate 0 and 1 in nickel hexacyano iron potassium.
- FIG. 1 is a schematic view showing a structural example of an ion selective electrode of the present invention.
- the ion selective electrode includes an ion sensitive film 101, an ion storage material layer 102, a conductive electrode 103, a conductive wiring 104, a terminal 105, and a cartridge 106.
- the ion sensitive film 101 includes a vinyl chloride resin, a plasticizer, a ligand, and a hydrophobic anion, and is adhered to the cartridge 106.
- the ion storage material layer 102 includes an ion storage material, conductive particles, and a bonding agent, and is disposed in the cartridge 106 in close contact with the ion sensitive film 101.
- the conductive electrode 103 is in close contact with the ion storage material layer 102 in the cartridge 106 and plays a role of supporting the ion storage material layer 102.
- the conductive wiring 104 is in contact with the conductive electrode 103.
- the terminal 105 is joined to the conductive wiring 104 and plays a role of extracting the potential of the ion storage material layer 102 through the conductive wiring 104 and the conductive electrode 103.
- the ions to be measured by the ion selective electrode of the present invention are ions of group 1 elements, ions of group 2 elements, ions of group 17 elements, hydronium ions, ammonium ions, and the like.
- the ion storage material layer 102 is made of, for example, a porous coordination polymer such as a Prussian blue analog described later, and stores ions to be measured.
- the ion-sensitive membrane 101 includes an ionophore such as a crown ether when cations such as group 1 element ions, group 2 element ions, hydronium ions, and ammonium ions are measured.
- those containing a cation ligand such as a quaternary ammonium salt can be used.
- FIG. 2 is a flowchart showing an example of the manufacturing process of the ion selective electrode.
- the manufacturing process (S201) of the ion sensitive membrane is as follows. Lithium ionophore (6,6-Dibenzyl-14-crown-4) 3.0mg, hydrophobic anion potassium tetrakis (4-chlorophenyl) borate 2.0mg, polyvinyl chloride ⁇ ⁇ 100mg, plasticizer 2-nitrophenyl octyl ether 200mg in 3ml tetrahydrofuran Melt. Place the solution in a Petri dish with a diameter of 33 mm and evaporate the tetrahydrofuran overnight.
- Lithium ionophore (6,6-Dibenzyl-14-crown-4) 3.0mg, hydrophobic anion potassium tetrakis (4-chlorophenyl) borate 2.0mg, polyvinyl chloride ⁇ ⁇ 100mg, plasticizer 2-nitrophenyl octyl ether 200mg in 3ml tetrahydrofur
- a sensitive film having a diameter of 6 mm is cut out from the obtained film.
- the above is the manufacturing process (S201) of the ion sensitive film.
- Lithium iron phosphate which is a lithium ion storage material
- S301 acetonitrile
- a reducing agent and lithium ions are added to the solution to adjust the lithium occlusion rate of lithium iron phosphate to about 100% (S302). Since the initial lithium occlusion rate was almost 100% this time, this step (S302) and the next separation, washing, drying and re-dispersing in acetonitrile (S303) were omitted.
- Nitronium tetrafluoroborate was added to the solution as an oxidizing agent that would cause the lithium storage rate to be approximately 50% (S304). This adjusts the lithium occlusion rate of lithium iron phosphate to 50%.
- the chemical formula corresponds to Li 0.5 FePO 4 .
- separation, washing, and drying were performed (S305) to obtain a lithium iron phosphate powder having a lithium occlusion rate of 50%.
- This powder 85% by weight
- a small amount of tetrahydrofuran was dropped onto an ion-sensitive membrane having a diameter of 6 mm, and a conductive electrode coated with an ion-occluding material layer having a diameter of 3 mm was adhered so that the ion-absorbing material layer was in contact with the ion-sensitive membrane (S203).
- the cartridge produced in step S203 was bonded to one end of a polyvinyl chloride pipe having an outer diameter of 6 mm and an inner diameter of 4 mm as a cartridge so as to have the configuration of FIG. 1 (S204).
- a wire with a carbon fiber attached to the tip of a copper wire was inserted as a conductive wiring into the wire produced in step S204 (S205), so that electrical connection was obtained as shown in FIG.
- the above is an example of the manufacturing process of the lithium ion selective electrode.
- the manufacturing process (S201) of the ion sensitive membrane is as follows. Dissolve 4.0 mg of potassium ionophore (Valinomycin), hydrophobic anion potassium tetrakis (4-chlorophenyl) borate 1.0 mg, polyvinyl chloride 133 mg, plasticizer dioctyl sebacate 267 mg in 4 ml of tetrahydrofuran. Place the solution in a Petri dish with a diameter of 33 mm and evaporate the tetrahydrofuran overnight. A sensitive film having a diameter of 6 mm is cut out from the obtained film. The above is the manufacturing process (S201) of the ion sensitive film.
- Nickel hexacyanoiron potassium which is a potassium ion storage material, is dispersed in pure water (S401).
- hydrogen peroxide or the like as a sufficient amount of an oxidizing agent is added to the solution (S402), centrifuged, washed and dried (S403).
- nickel hexacyanoiron potassium having a high potassium ion occlusion rate potassium ions to be occluded with ascorbic acid or the like as a sufficient amount of reducing agent are added to the solution (S404), centrifuged, washed and dried (S405). By mixing these at a desired ratio (S406), nickel hexacyanoiron potassium having a desired potassium storage rate can be obtained.
- nickel hexacyanoiron potassium is represented by K 1 + x Ni [Fe (CN) 6 ], and nickel hexacyanoiron potassium having a potassium storage rate of about 0% in the steps of S402 and S403, In steps S404 and S405, potassium nickel hexacyanoiron having a potassium storage rate of about 100% is obtained.
- potassium nickel hexacyanoiron with a potassium storage rate of about 50% is obtained.
- the average ion storage rate can be obtained by mixing the particles in this way is that ions are actually exchanged between the ion storage materials, or the time from manufacture to use of the ion selective electrode. However, it can be considered that the average value behaves as an averaged value for several days to several months because it is sufficiently longer than the time scale of diffusion of ions within and between ion storage materials (approximately seconds to hours).
- the obtained potassium nickel hexacyanoferrate (85% by weight), graphite (10% by weight) as a conductive agent, and polyvinylidene fluoride (5% by weight) as a bonding agent were dissolved in N-methylpyrrolidone (S407). ), Applied to a graphite sheet as a conductive electrode with a thickness of about 100 ⁇ m, and dried overnight in a 60 ° C. oven (S408). After compressing it at a pressure of 1 ⁇ 10 5 N / m 2 , it was cut into a diameter of 3 mm.
- the above is the step (S202) of producing the ion storage material layer on the conductive electrode.
- a small amount of tetrahydrofuran was dropped onto an ion-sensitive membrane having a diameter of 6 mm, and a conductive electrode coated with an ion-occluding material layer having a diameter of 3 mm was adhered so that the ion-absorbing material layer was in contact with the ion-sensitive membrane (S203).
- the cartridge produced in step S203 was bonded to one end of a polyvinyl chloride pipe having an outer diameter of 6 mm and an inner diameter of 4 mm as a cartridge so as to have the configuration of FIG. 1 (S204).
- a wire with a carbon fiber attached to the tip of a copper wire was inserted as a conductive wiring into the wire produced in step S204 (S205), so that electrical connection was obtained as shown in FIG.
- the above is an example of the manufacturing process of a potassium ion selective electrode.
- the step of adjusting the ion storage rate of the ion storage material may be a method of adjusting by the amount of reducing agent as shown in FIG. 5 in addition to FIGS. Steps S501, S503, S505, S506, and S507 in FIG. 5 correspond to steps S301, S303, S305, S306, and S307 in FIG. 3, respectively.
- Step S502 is a step of adding a sufficient amount of oxidizing agent to the solution to adjust the target ion storage rate of the ion storage material to about 0%.
- Step S504 is a step of adding a necessary amount of reducing agent and target ions to the solution and adjusting the target ion storage rate of the ion storage material to a desired value.
- the step of increasing the ion storage rate with a reducing agent (S302) is omitted, or the step of reducing the ion storage rate with an oxidizing agent (S402) or with a reducing agent.
- the step of increasing the ion storage rate (S404) can be omitted, or the step of reducing the ion storage rate with an oxidizing agent (S502) can be omitted.
- the ion occlusion rate of the ion occlusion material contained in the ion occlusion material layer does not necessarily need to be 50%. Typically, if the ion occlusion rate is adjusted to fall within the range of 0.1 to 0.9. Good.
- the ions stored in the ion storage material are ions of the first group element, second group element, hydronium ion, or ammonium ion. It is applicable to.
- FIG. 6 is a schematic view showing an example of a measuring apparatus using the ion selective electrode of the present invention.
- the ion selective electrode 601 and the reference electrode 602 of the present invention are connected to a potentiometer 603 and immersed in the sample solution 604. Examples of measurement results using this measuring apparatus are shown below.
- As the reference electrode 602 a silver-silver chloride reference electrode using 1M potassium chloride as an internal solution was used. Other reference electrodes such as saturated calomel electrodes may be used.
- FIG. 7 is a diagram showing an example of the measurement result of lithium ions using the lithium ion selective electrode (LFP-ISE) of the present invention.
- LFP-ISE lithium ion selective electrode
- the potential between the ion sensitive membrane and the ion storage material layer is constant, and the potential at the interface between the ion sensitive membrane and the sample solution responds to the lithium ion concentration in the sample solution.
- FIG. 8 is a diagram showing a measurement example of long-term potential fluctuation of the lithium ion selective electrode.
- the potential fluctuation in 41 days was -1.7 ⁇ V / h for the solid contact type lithium ion selective electrode and smaller than -8.1 ⁇ V / h for the internal liquid type ion selective electrode.
- the potential of the solid contact type lithium ion selective electrode having no ion storage material layer varies greatly. That is, this potential stability is due to lithium iron phosphate whose ion occlusion rate is adjusted to 50% in the process of FIG.
- the solid contact type lithium ion selective electrode showed high reproducibility of 98.7 ⁇ 1.4mV on the first day, and maintained high reproducibility of 93.5mV ⁇ 1.3mV on the 41st day. This reproducibility is comparable to 164.6 ⁇ 0.5mV on the first day of the internal liquid ion selective electrode.
- This high potential reproducibility is due to the lithium iron phosphate whose ion storage rate was adjusted to 50% in the process of FIG.
- the ion storage rate can be adjusted electrochemically after forming the ion storage material layer, the process shown in FIG. 3 is performed from the viewpoint of high reproducibility, simplicity, and mass production. Are better.
- the ion storage rate is adjusted electrochemically, unevenness of the ion storage rate is likely to occur in the ion storage material, and it is not easy to adjust to the desired ion storage rate.
- the potential reproducibility in the same lot can be improved when producing a plurality of ion selective electrodes and cartridges having ion selective electrodes. As a result, pre-shipment inspection becomes simple, and calibration at the time of use becomes simple or unnecessary. The same effect can be obtained when the ion occlusion rate is adjusted in the step shown in FIG. 4 or 5 instead of the step in FIG.
- FIGS. 9A to 9C are diagrams showing measurement results of potassium ion, sodium ion, and calcium ion using the potassium ion selective electrode, sodium ion selective electrode, and calcium ion selective electrode of the present invention, respectively.
- Responses according to the Nernst equation were obtained at 10 -5 to 1 mol / l depending on the concentrations of the sample solutions potassium chloride, sodium chloride, and calcium chloride.
- the reason why the sensitivity seems to decrease in the high concentration region in the measurement of calcium chloride is that the calcium activity is not linear with respect to the calcium chloride concentration due to the interaction of ions. If the activity is calculated using the Debye-Huckel approximation, it can be seen that the Nernst response is obtained even in the high concentration range.
- nickel hexacyanoiron potassium and copper hexacyanoiron potassium were used as the ion storage material layer and the potassium sensitive membrane was used as the ion sensitive membrane as the solid contact ion selective electrode. In the figure, they are indicated as K-NiHCF-ISE and K-CuHCF-ISE.
- As the internal liquid ion selective electrode 10 mmol / l potassium chloride was used for the internal liquid, silver silver chloride was used for the internal electrode, and a potassium sensitive film was used for the ion sensitive film.
- nickel hexacyanoiron sodium was used for the ion storage material layer, and a sodium sensitive film was used for the ion sensitive film.
- Na-NiHCF-ISE As the internal liquid ion selective electrode, 10 mmol / l sodium chloride was used for the internal liquid, silver-silver chloride was used for the internal electrode, and a sodium sensitive film was used for the ion sensitive film.
- FIG. 9C as the solid contact ion selective electrode, nickel hexacyanoiron calcium was used for the ion storage material layer, and a calcium sensitive membrane was used for the ion sensitive membrane.
- Ca-NiHCF-ISE As the internal liquid ion selective electrode, 10 mmol / l calcium chloride was used for the internal liquid, silver-silver chloride was used for the internal electrode, and a calcium sensitive film was used for the ion sensitive film.
- the ion selectivity of each ion selective electrode is a value corresponding to the selectivity of the ion sensitive membrane.
- any of the solid contact ion selective electrodes is the same as the ion sensitive membrane. It can be seen that the potential between the ion storage material layers is constant, and the potential at the interface between the ion sensitive membrane and the sample solution is responsive to the concentration of the target ion in the sample solution.
- FIG. 10 is a diagram showing the potential stability of the sodium ion selective electrode, potassium ion selective electrode, and calcium ion selective electrode, which are solid contact ion selective electrodes of the present invention. It can be seen that both show high potential stability. These high potential stability results from the fact that an ion storage material layer having a high uniformity of ion storage rate was obtained by the method of controlling the ion storage rate of the ion storage material layer described in FIGS. It is a cause.
- the potential variation (standard deviation) one month after fabrication was 15.1 mV for K-CuHCF-ISE, 0.6 mV for K-NiHCF-ISE, 8.6 mV for Na-NiHCF-ISE, and 8.7 mV for Ca-NiHCF-ISE It was small. Therefore, by adjusting the ion occlusion rate in the steps shown in FIGS. 3, 4, and 5, the potential reproducibility in the same lot is improved when producing a plurality of ion selective electrodes and cartridges having ion selective electrodes. be able to. As a result, pre-shipment inspection becomes simple, and calibration at the time of use becomes simple or unnecessary.
- FIG. 11 is a diagram showing the relationship between the ion storage rate of the ion storage material layer and the potential.
- the definition of the ion storage rate x is K 1 + x Ni [Fe (CN) 6 ] for nickel hexacyanoiron potassium (K-NiHCF) and Na 1 + x Ni [Fe (CN) for nickel hexacyanoiron sodium (Na-NiHCF).
- nickel hexacyanoferrate iron calcium (Ca-NiHCF) the Ca 1/2 + x / 2 Ni [Fe (CN) 6]
- the copper hexacyanoferrate potassium K-CuHCF) K 1 + x Cu [Fe (CN ) 6]
- iron hexacyanoferrate potassium (K-FeHCF) the K 1 + x Fe [Fe ( CN) 6]
- the lithium iron phosphate is a Li x FePO 4.
- an electrode coated with an ion storage material to be measured was used as the working electrode.
- lithium iron phosphate (85% by weight), graphite (10% by weight) as a conductive agent, and polyvinylidene fluoride (5% by weight) as a bonding agent are dissolved in N-methylpyrrolidone and glassy carbon is dissolved.
- the electrode was applied to a thickness of about 100 ⁇ m and dried in a 60 ° C. oven overnight.
- a silver / silver chloride electrode was used as the reference electrode, and a platinum electrode was used as the counter electrode.
- FIG. 11A shows a potential response when a constant current is applied to lithium iron phosphate in a 1M lithium chloride aqueous solution.
- the ion storage rate shows a substantially constant potential in a wide range of about 0.1 to 0.9. This is because the interfacial potential of iron iron phosphate is determined by the two-phase reaction of FePO 4 and LiFePO 4 .
- FIG. 11 (b) shows a case where nickel hexacyanoiron sodium in a 0.5M aqueous sodium sulfate solution, nickel hexacyanoiron potassium in a 0.5M aqueous potassium sulfate solution, and nickel hexacyanoiron calcium in a 1M aqueous calcium nitrate solution are applied to a constant current, respectively. It is a figure showing an electric potential response.
- FIG. 11 (c) is a diagram showing the potential response to constant current application of iron hexacyanoiron potassium, nickel hexacyanoiron potassium, and copper hexacyanoiron potassium in 0.5M potassium sulfate aqueous solution.
- the method for controlling the ion storage rate of the ion storage material layer described with reference to FIGS. 3 to 5 is particularly effective when an ion storage material having a porous coordination polymer whose potential depends on the ion storage rate is used. work.
- the ion occlusion material layer of the solid contact ion selective electrode of the present invention has an ion occlusion rate of 0.1 to 0.9, preferably 0.2 to 0.8, and more preferably 0.8. It is preferably 3 to 0.7, and most preferably has an ion occlusion rate of 0.4 to 0.6, where the ion occlusion rate is substantially 0.5.
- Nickel hexacyano iron and copper hexacyano iron are particularly suitable as the ion storage material layer of the ion selective electrode of the present invention.
- Iron hexacyanoiron described in US Pat. No. 4,859,306 has a property of being easily oxidized, and is also used as an electrode for measuring hydrogen peroxide by utilizing the function of reducing hydrogen peroxide to water. For this reason, there is a concern about fluctuations in the ion storage rate due to oxidation in the process of adjusting the ion storage rate or oxidation after forming the ion selective electrode. Actually, although the procedure shown in FIGS.
- Nickel hexacyano iron and copper hexacyano iron are relatively difficult to oxidize because the potential associated with occluding and releasing ions is higher than that of iron hexacyano iron.
- nickel hexacyanoiron potassium having an initial ion occlusion rate of about 0.1 could be adjusted to about 0.5 by reduction in the presence of potassium. It is possible to adjust the ion storage rate with copper hexacyanoiron as well.
- copper hexacyanoiron is easily reduced because the potential associated with the occlusion and release of ions is higher, and for example, the potential of the ion selective electrode may drift to a low potential as shown in FIG.
- FIG. 12 is a diagram showing that there is a high correlation between the potential of the ion storage material layer and the potential of the solid contact ion selective electrode.
- the horizontal axis represents the potential of the ion storage material layer having no ion-sensitive membrane, and the vertical axis represents the potential of the solid contact ion selective electrode.
- the measured values are distributed along a straight line indicating the coincidence of both potentials, and it can be seen that the potential of the solid contact ion selective electrode reflects the potential of the ion storage material layer. In other words, the potential reproducibility of the ion storage material layer is improved by the method of controlling the ion storage rate of the ion storage material layer described in FIGS.
- FIG. 13 is a diagram showing an example of a method for synthesizing a porous coordination polymer. Details will be described by taking nickel hexacyanoiron potassium as an example.
- a solution containing nickel ions as the metal ions M for example, a nickel nitrate aqueous solution is prepared (S1301).
- solution A A solution containing nickel ions as the metal ions M
- nickel nitrate aqueous solution is prepared (S1301).
- solution A a solution containing cyan as the organic ligand, iron ions as the metal ion M ′, and potassium as the target ion, for example, a potassium ferricyanide aqueous solution
- S1302 a solution containing cyan as the organic ligand, iron ions as the metal ion M ′, and potassium as the target ion, for example, a potassium ferricyanide aqueous solution.
- solution B The order of S1301 and S1302 does not matter.
- Solution A and solution B are mixed to obtain a precipitate of nickel hexacyanoiron potassium, which is the target compound, as a product (S1303).
- a magnetic stirrer stirring by applying ultrasonic waves, dropping mixing of both solutions using a peristaltic pump, etc., and temperature control by a heater.
- the obtained precipitated product is dried after repeating centrifugation and washing with pure water (S1304).
- a solution B containing each ion may be prepared instead of potassium.
- Nion storage material having a porous coordination polymer containing a target ion not included in the solution B.
- nickel hexacyanoiron potassium is synthesized by the method of FIG. Subsequently, the method of FIG. 5 is used. By the oxidation reaction generated in S502, potassium of nickel hexacyanoiron potassium is released. Actually, potassium ions necessary to maintain the crystal structure are said to remain in the crystal.
- the structural formula is KNi [Fe (CN) 6 ].
- the ion storage rate is defined by K 1 + x Ni [Fe (CN) 6 ]
- the ion storage rate x is considered to be close to zero.
- a solution containing a reducing agent and sodium ions as target ions is used.
- a sodium ascorbate aqueous solution is used.
- the structural formula of the obtained compound is KNa 0.5 Ni [Fe (CN) 6 ]. In this way, an ion storage material having a porous coordination polymer containing sodium as the target ion can also be obtained.
- the porous coordination polymer can occlude various ions.
- ions of group 1 elements, ions of group 2 elements, ions of group 17 elements, hydronium ions, and ammonium ions which are attractive target ions as measurement targets, can be occluded.
- Corresponding ion-sensitive membranes include those that contain ionophores such as crown ether in cations such as group 1 element ions, group 2 element ions, hydronium ions, and ammonium ions.
- ions those containing a cation ligand such as a quaternary ammonium salt can be used.
- the structural formula of the target ion occluded is A a M x [M '(CN) 6 ] y ⁇ z ⁇ kH 2 0 It is represented by A is one or more kinds of group 1 elements, group 2 elements, hydronium or ammonium, M and M ′ are one or more kinds of transition metals, and M or M ′ is nickel, cobalt, copper , Silver and cadmium are included, ⁇ is a vacancy of the porous coordination polymer, x and y are larger than 0, and a, z and k are numbers of 0 or more.
- nickel hexacyanoiron potassium is KNi [Fe (CN) 6 ]
- nickel hexacyanoiron sodium is NaNi [Fe (CN) 6 ]
- nickel hexacyanoiron calcium is CaNi [Fe (CN) 6 ]
- copper hexacyanoiron Potassium is KCu [Fe (CN) 6 ]
- iron hexacyanoiron potassium is KFe [Fe (CN) 6 ]
- cobalt hexacyanoiron potassium is KCo [Fe (CN) 6 ]
- silver hexacyanoiron potassium is KAg 3 [Fe (CN 6 )
- potassium cadmium hexacyanoiron is K 2 Cd [Fe (CN) 6 ] ⁇ 6H 2 O.
- FIG. 14 is a view showing an example of a cartridge using the solid contact ion selective electrode of the present invention.
- the cartridge has a short side of about 15 mm, a long side of about 20 mm, and a thickness of about 1 mm.
- FIG. 14A shows the state of the cartridge before forming the solid contact ion selective electrode
- FIG. 14B shows a sectional view thereof.
- a terminal 1402 made of an insulating material such as PET (polyethylene terephthalate), PS (polystyrene), PC (polycarbonate), etc.
- a terminal 1402 made of an insulating material such as PET (polyethylene terephthalate), PS (polystyrene), PC (polycarbonate), etc.
- a terminal 1402 made of an insulating material such as PET (polyethylene terephthalate), PS (polystyrene), PC (polycarbonate), etc.
- a terminal 1402 made of an insulating material such as
- an insulating film 1405 is formed so as to mainly cover the wiring 1403. These are produced by printing, sputtering, vapor deposition or the like.
- FIG. 14C shows a state where the solid contact ion selection electrode is formed on the cartridge of FIG. 14A
- FIG. 14D shows a cross-sectional view thereof.
- An ion storage material layer 1406 is formed on the conductive electrode 1404, and an ion sensitive film 1407 is formed so as to cover it. That is, the cartridge of FIG. 14 plays the same role as the case where a plurality of ion selection electrodes of FIG. 1 are arranged.
- FIG. 15 is a diagram showing an example of a manufacturing process of the cartridge as shown in FIG. S1501 to S1504 are steps for synthesizing an ion storage material having a porous coordination polymer.
- an aqueous nickel nitrate solution is prepared as a solution containing nickel ions as the metal ions M (S1501).
- solution A an aqueous potassium ferricyanide solution is prepared as a solution containing cyan as the organic ligand and iron ions as the metal ion M ′ (S1502).
- Solution B Solution A and solution B are mixed to obtain precipitation of potassium nickel hexacyanoiron, which is a compound (S1503). Centrifugation and washing with pure water are repeated and dried to obtain an ion storage material (S1504).
- S1505 to S1507 are steps for bringing the ion storage rate close to zero.
- An ion storage material in this case, nickel hexacyanoiron potassium is dispersed in an aqueous solution (S1505), a sufficient amount of an oxidizing agent such as hydrogen peroxide is added (S1506), centrifugation and washing with pure water are repeated, dried, and ionized.
- An ion storage material having an absorption rate close to 0 is obtained (S1507).
- the particles are dispersed again in the aqueous solution (S1508), and the subsequent S1509 to S1510 and S1514 to S1515 are steps for storing a desired amount of each target ion in the ion storage material.
- step S1509 ascorbic acid is added as a reducing agent, and sodium ascorbate aqueous solution, which is an aqueous solution containing sodium as target ion I, is added, and a desired amount of sodium ions is occluded in nickel hexacyanoiron potassium.
- step S1510 centrifugal separation and washing are repeated and dried to obtain an ion occlusion material that occludes sodium.
- step S1514 ascorbic acid is added as a reducing agent, and an aqueous potassium ascorbate solution containing potassium as the target ion J is added, and a desired amount of potassium ions is occluded in nickel hexacyanoiron potassium.
- step S1515 centrifugal separation and washing are repeated and dried to obtain an ion occlusion material that occludes potassium.
- the obtained ion storage material (85% by weight), graphite (10% by weight) as a conductive agent, and polyvinylidene fluoride (5% by weight) as a bonding agent were dissolved in N-methylpyrrolidone (S1511 and In step S1516, the conductive material 1404 is applied and dried to form an ion storage material layer 1406 (S1512 and S1517). An ion sensitive film for target ions is further applied and dried on the ion storage material layer 1406 (S1513 and S1518) to obtain a cartridge.
- each ion storage material has a porous coordination polymer, for example, nickel hexacyano iron or copper hexacyano iron can store multiple types of ions.
- a part of the manufacturing process can be shared.
- sodium and potassium are exemplified, but the present invention can be similarly applied to ions that can be stored by an ion storage material having a porous coordination polymer, for example, lithium, sodium, ammonium, magnesium, calcium, strontium, and barium.
- FIG. 16 is a diagram showing another example of the manufacturing process of the cartridge as shown in FIG. S1601, S1602 to S1604, and S1609 to S1611 are steps for synthesizing an ion storage material having a porous coordination polymer.
- an aqueous nickel nitrate solution is prepared as a solution containing nickel ions as the metal ions M (S1601).
- solution A an aqueous sodium ferrocyanide solution is prepared as a solution containing cyan as the organic ligand, iron ions as the metal ions M ′, and sodium as the target ions (S1602).
- Solution B Solution A and solution B are mixed to obtain a precipitate of nickel hexacyanoiron sodium as a compound (S1603). Centrifugation and washing with pure water are repeated and dried to obtain an ion storage material (S1604).
- an aqueous potassium ferricyanide solution is prepared as a solution containing cyan as the organic ligand, iron ions as the metal ion M ′′, and potassium as the target ion (S1609).
- solution C are mixed to obtain a precipitate of nickel hexacyanoiron potassium as a compound (S1610) Centrifugation and washing with pure water are repeated and dried to obtain an ion storage material (S1611).
- S1605 and S1612 are steps for adjusting the ion storage rate, and the steps shown in S301 to S305 in FIG. 3, the steps shown in S401 to S406 in FIG. 4 and the steps shown in S501 to S505 in FIG. 5 can be used.
- the obtained ion storage material (85% by weight), graphite (10% by weight) as a conductive agent, and polyvinylidene fluoride (5% by weight) as a bonding agent were dissolved in N-methylpyrrolidone (S1606 and S1613), the conductive electrode 1404 is coated and dried to form an ion storage material layer 1406 (S1607 and S1614).
- An ion sensitive film for target ions is further applied and dried on the ion storage material layer 1406 (S1608 and S1615) to obtain a cartridge.
- FIG. 17 is a diagram showing another example of a method for adjusting the ion storage rate of a porous coordination polymer.
- an aqueous nickel nitrate solution is prepared as a solution containing nickel ions (S1701).
- solution A a solution containing nickel ions
- a mixed solution of an aqueous potassium ferrocyanide solution and an aqueous potassium ferricyanide solution is prepared as an aqueous solution containing an organic ligand, iron ions, and potassium ions (S1702).
- Solution B contains a mixture of bivalent and trivalent iron, which is a transition metal.
- the potassium ion occlusion rate of the obtained porous coordination polymer is measured (S1705), and it is determined whether or not the desired ion occlusion rate is obtained (S1706). If the ion storage rate is desired, the obtained porous coordination polymer is used as a material for the ion selective electrode. If it is different from the desired occlusion rate, for example, by adjusting the mixing ratio of the aqueous solution of potassium ferrocyanide and aqueous solution of potassium ferricyanide in solution B, the mixing ratio of divalent iron and trivalent iron in solution B is adjusted, and the synthesis is performed again. . Alternatively, the mixing amount ratio between the solution A and the solution B may be adjusted.
- a criterion for determining the ion storage rate for example, a criterion for determining that the ion storage rate is in the range of 0.1 to 0.9 can be adopted.
- criteria for accepting an ion storage rate of 0.2 to 0.8, criteria for accepting an ion storage rate of 0.3 to 0.7, and ion storage rates of 0.4 to 0.6 You may employ
- FIG. 20 is a diagram showing a comparison of absorption spectra when the storage rates are 0 and 1 in nickel hexacyanoiron potassium. When the storage rate is 0, the peak observed around 440 nm disappears when the storage rate is 1. The occlusion rate can be measured using the intensity of this peak.
- FIG. 18 is a diagram showing an example of a cartridge with a flow path using a solid contact ion selective electrode.
- FIG. 18A is a side view
- FIG. 18B is a top view.
- the cartridge with flow path 1801 has a flow path 1804, and an inflow port 1802 and an outflow port 1803 are connected to the flow path 1804.
- a cartridge 1805 as illustrated in FIG. 14 without a flow path is embedded in the cartridge 1801 with a flow path, and a chloride ion selection electrode 1806, a potassium ion selection electrode 1807, and a sodium ion selection electrode 1808 are arranged in the flow path 1804.
- Terminals 1809 to 1811 corresponding to the respective electrodes are exposed to the outside of the cartridge with flow path 1801.
- FIG. 19 is a schematic diagram showing an example of an electrolyte concentration measuring apparatus using a cartridge with a flow path.
- the electrolyte concentration measuring apparatus includes a measurement unit 1901, a control unit 1902, a calculation recording unit 1903, and an output unit 1904.
- a control unit 1902, an operation recording unit 1903, and an output unit 1904 are connected to the measurement unit 1901.
- the control unit 1902 controls each component of the measurement unit 1901 described below.
- the operation recording unit 1903 calculates the ion concentration of the measurement target from the potential measured by the measurement unit 1901 or the like.
- the output unit 1904 is a display or a printer.
- the control unit 1902 and the operation recording unit 1903 may be realized using a general-purpose computer or may be realized as a function of a program executed on the computer. That is, the processing of the control unit 1902 and the operation recording unit 1903 described below may be realized by storing a program code in a storage unit such as a memory and executing a program code by a processor such as a CPU.
- the control unit 1902 and the operation recording unit 1903 may be configured by hardware such as a dedicated circuit board.
- the measurement unit 1901 includes a dilution tank 1911, a specimen dispensing nozzle 1912, a diluent dispensing nozzle 1913, a reference liquid dispensing nozzle 1914, a sample liquid suction nozzle 1915, a pipe 1916, and a cartridge 1917 with a channel as illustrated in FIG. , A pipe 1918, a reference electrode 1919, a pipe 1920, a pump 1921, a pipe 1922, a waste liquid reservoir 1923, and a potential measuring unit 1924.
- a sample solution suction nozzle 1915, a pipe 1916, a pipe 1921, and a pump 1922 are used as a sample introduction part for introducing a sample liquid containing an electrolyte.
- the sample solution is introduced into the cartridge 1917 and the reference electrode 1919 using the sample introduction unit. Then, the potential difference between the electrodes is measured with the sample solution introduced. A detailed configuration will be described below.
- the specimen dispensing nozzle 1912 dispenses and discharges specimens such as blood and urine to the dilution tank 1911, and the diluent dispensing nozzle 1913 dispenses and discharges the diluent to the dilution tank 1911.
- the reference liquid dispensing nozzle 1914 dispenses and discharges a reference liquid having a known concentration to the dilution tank 1911.
- the sample liquid suction nozzle 1915 can move up and down, and sucks the solution in the dilution tank 1911 by the driving force of the pump 1921.
- the sucked solution is introduced into the cartridge 1917 and the reference electrode 1919 through the pipes 1916 and 1918 and further drained through the pipes 1920 and 1922.
- a terminal of the cartridge 1917 and the reference electrode 1919 are connected to the potential measuring unit 1924.
- the diluent does not contain ions to be measured, such as tris borate buffer or bistris borate buffer.
- ions to be measured such as tris borate buffer or bistris borate buffer.
- a measurement target ion having a blood concentration reference value or the like for example, a solution of about 140 mM sodium, 4 mM potassium, and 100 mM chlorine can be used as a sample and diluted with a dilution solution at a certain dilution rate.
- this invention is not limited to the above-mentioned Example, Various modifications are included.
- the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
- a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
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Abstract
Description
図1は,本発明のイオン選択電極の構造例を示す概略図である。このイオン選択電極は,イオン感応膜101,イオン吸蔵物質層102,導電性電極103,導電性配線104,端子105,カートリッジ106を備える。イオン感応膜101は,塩化ビニル樹脂,可塑剤,リガンド,疎水性アニオンを含み,カートリッジ106に接着されている。イオン吸蔵物質層102はイオン吸蔵物質,導電性粒子,接合剤を含み,イオン感応膜101と密着してカートリッジ106内に配置されている。導電性電極103はカートリッジ106内でイオン吸蔵物質層102に密着しており,イオン吸蔵物質層102を支持する役割を果たす。導電性配線104は導電性電極103に接触している。端子105は導電性配線104と接合されており,導電性配線104,導電性電極103を通じてイオン吸蔵物質層102の電位を取り出す役割を果たす。
AaMx[M’(CN)6]y□z・kH20
で表される。Aは一種類又は複数種類の第一族元素,第二族元素,ヒドロニウム又はアンモニウムであり,M及びM’は一種類又は複数種類の遷移金属であり,M又はM’はニッケル,コバルト,銅,銀,カドミウムの少なくとも一つを含み,□は多孔配位高分子の空位であり,x,yは0より大きく,a,z,kは0以上の数である。
102 イオン吸蔵物質層
103 導電性電極
104 導電性配線
105 端子
106 カートリッジ
601 イオン選択電極
602 参照電極
603 電位差計
604 試料液
1401 基板
1402 端子
1403 配線
1404 導電性電極
1405 絶縁膜
1406 イオン吸蔵物質層
1407 イオン感応膜
1801 流路付きカートリッジ
1804 流路
1805 カートリッジ
1806 塩素イオン選択電極
1807 カリウムイオン選択電極
1808 ナトリウムイオン選択電極
1901 測定ユニット
1917 流路付きカートリッジ
1919 参照電極
Claims (12)
- 第一族元素のイオン,第二族元素のイオン,ヒドロニウムイオン又はアンモニウムイオンを対象イオンとするイオン感応膜と,
イオン吸蔵物質層と,
導電性電極と,を有し,
前記イオン吸蔵物質層に含まれるイオン吸蔵物質は前記対象イオンを吸蔵しており,
前記イオン吸蔵物質は構造式AaMx[M’(CN)6]y□z・kH20で表されるプルシアンブルー類似体であり,
Aは一種類又は複数種類の第一族元素,第二族元素,ヒドロニウム又はアンモニウムであり,
M及びM’は一種類又は複数種類の遷移金属であり,
M又はM’はニッケル,コバルト,銅,銀,カドミウムの少なくとも一つを含み,
□は多孔配位高分子の空位であり,
x,yは0より大きく,a,z,kは0以上の数である,イオン選択電極。 - イオン選択電極を複数有するカートリッジであって,
前記イオン選択電極の一つをイオン選択電極Aとし,前記イオン選択電極の別の一つをイオン選択電極Bとするとき,
前記イオン選択電極A及び前記イオン選択電極Bは,
第一族元素のイオン,第二族元素のイオン,第十七族元素のイオン,ヒドロニウムイオン又はアンモニウムイオンを対象イオンとするイオン感応膜と,
イオン吸蔵物質層と,
導電性電極と,を有し,
前記イオン吸蔵物質層に含まれるイオン吸蔵物質は前記対象イオンを吸蔵しており,
前記イオン吸蔵物質は多孔配位高分子であり,
前記イオン選択電極Aの前記対象イオンと前記イオン選択電極Bの前記対象イオンが異なる,カートリッジ。 - イオン選択電極を作製する方法であって,
前記イオン選択電極は,第一族元素のイオン,第二族元素のイオン,第十七族元素のイオン,ヒドロニウムイオン又はアンモニウムイオンを対象イオンとするイオン感応膜と,イオン吸蔵物質層と,導電性電極と,を有し,
前記イオン吸蔵物質は多孔配位高分子であり,
前記多孔配位高分子を作製する工程は,
遷移金属Mを含む溶液Aと遷移金属M’を含む溶液Bを混合する工程と,
前記混合による生成物から前記多孔配位高分子を回収する工程とを含み,
前記遷移金属Mと前記遷移金属M’は同一もしくは異なり,
少なくとも前記溶液Aは異なる価数の遷移金属Mを含んでいて,
前記溶液Aと前記溶液Bの少なくとも一方は有機配位子を含む,
イオン選択電極を作製する方法。 - 請求項3に記載のイオン選択電極を作製する方法であって,
回収した多孔配位高分子の状態を調べる工程と,
前記状態に基づいて前記溶液Aに含まれる前記遷移金属Mの異なる価数の混合量比もしくは前記溶液Aと前記溶液Bの混合量比を調整する工程とを含む,
イオン選択電極を作製する方法。 - 請求項4に記載のイオン選択電極を作製する方法であって,
前記回収した多孔配位高分子の状態を調べる工程において元素分析を行う,
イオン選択電極を作製する方法。 - 請求項4に記載のイオン選択電極を作製する方法であって,
前記回収した多孔配位高分子の状態を調べる工程において電位計測を行う,
イオン選択電極を作製する方法。 - 請求項4に記載のイオン選択電極を作製する方法であって,
前記回収した多孔配位高分子の状態を調べる工程において吸光度計測を行う,
イオン選択電極を作製する方法。 - 請求項4に記載のイオン選択電極を作製する方法であって,
前記回収した多孔配位高分子の状態を調べる工程において,前記イオン吸蔵物質層のイオン吸蔵率が0.1~0.9の範囲にあることを判定の条件とする,
イオン選択電極を作製する方法。 - イオン選択電極を作製する方法であって,
前記イオン選択電極は,第一族元素のイオン,第二族元素のイオン,第十七族元素のイオン,ヒドロニウムイオン又はアンモニウムイオンを対象イオンとするイオン感応膜と,イオン吸蔵物質層と,導電性電極と,を有し,
前記イオン吸蔵物質層を作製する工程として,
イオン吸蔵物質を溶液に分散させる工程,
前記イオン吸蔵物質を分散させた溶液に酸化還元物質を添加する工程,
前記酸化還元物質の添加によってイオン吸蔵率が調整されたイオン吸蔵物質を回収する工程を含む,
イオン選択電極を作製する方法。 - 請求項9に記載のイオン選択電極を作製する方法であって,
前記イオン吸蔵物質層のイオン吸蔵率を0.1~0.9の範囲に調整する,
イオン選択電極を作製する方法。 - イオン選択電極を作製する方法であって,
前記イオン選択電極は,第一族元素のイオン,第二族元素のイオン,第十七族元素のイオン,ヒドロニウムイオン又はアンモニウムイオンを対象イオンとするイオン感応膜と,イオン吸蔵物質層と,導電性電極と,を有し,
前記イオン吸蔵物質層を作製する工程として,
前記対象イオンのイオン吸蔵率が第1の値である第1のイオン吸蔵物質を調製する工程と,
前記対象イオンのイオン吸蔵率が第2の値である第2のイオン吸蔵物質を調製する工程と,
前記第1のイオン吸蔵物質と前記第2のイオン吸蔵物質を混合する工程とを含む,
イオン選択電極を作製する方法。 - 請求項11に記載のイオン選択電極を作製する方法であって,
前記イオン吸蔵物質層のイオン吸蔵率を0.1~0.9の範囲に調整する,
イオン選択電極を作製する方法。
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| US15/754,450 US10871464B2 (en) | 2015-09-14 | 2016-08-30 | Ion-selective electrode, method of manufacture thereof, and cartridge |
| CN201680049256.9A CN107923866B (zh) | 2015-09-14 | 2016-08-30 | 离子选择电极、其制作方法和电极盒 |
| JP2017539817A JP6494770B2 (ja) | 2015-09-14 | 2016-08-30 | イオン選択電極、その作製方法及びカートリッジ |
| EP16846245.5A EP3351931B1 (en) | 2015-09-14 | 2016-08-30 | Ion-selective electrode and method of manufacture thereof |
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| JP2020046364A (ja) * | 2018-09-20 | 2020-03-26 | Koa株式会社 | 全固体型イオン選択性電極、および全固体型イオン選択性電極の製造方法 |
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| CN108760845A (zh) * | 2018-05-21 | 2018-11-06 | 浙江工业大学 | 一种改性pb修饰电极及其制备方法 |
| CN108760845B (zh) * | 2018-05-21 | 2020-06-09 | 浙江工业大学 | 一种改性pb修饰电极及其制备方法 |
| JP2020046364A (ja) * | 2018-09-20 | 2020-03-26 | Koa株式会社 | 全固体型イオン選択性電極、および全固体型イオン選択性電極の製造方法 |
| JP7146189B2 (ja) | 2018-09-20 | 2022-10-04 | Koa株式会社 | 全固体型イオン選択性電極の製造方法 |
| WO2023276380A1 (ja) * | 2021-07-02 | 2023-01-05 | シスメックス株式会社 | イオンセンサ、イオンセンサの製造方法及びイオンの測定方法 |
| JP2023007958A (ja) * | 2021-07-02 | 2023-01-19 | シスメックス株式会社 | イオンセンサ、イオンセンサの製造方法及びイオンの測定方法 |
| JP7685381B2 (ja) | 2021-07-02 | 2025-05-29 | シスメックス株式会社 | イオンセンサ、イオンセンサの製造方法及びイオンの測定方法 |
| US12399145B2 (en) | 2021-07-02 | 2025-08-26 | Sysmex Corporation | Ion sensor, ion sensor manufacturing method, and ion measurement method |
| WO2023026883A1 (ja) | 2021-08-24 | 2023-03-02 | Koa株式会社 | 全固体型カリウムイオン選択性電極、および全固体型カリウムイオン選択性電極の製造方法 |
| WO2024042855A1 (ja) * | 2022-08-25 | 2024-02-29 | Koa株式会社 | 全固体型カリウムイオン選択性電極 |
| WO2024042854A1 (ja) * | 2022-08-25 | 2024-02-29 | Koa株式会社 | 全固体型カリウムイオン選択性電極およびその製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6494770B2 (ja) | 2019-04-03 |
| JPWO2017047374A1 (ja) | 2018-07-05 |
| US20180246054A1 (en) | 2018-08-30 |
| US10871464B2 (en) | 2020-12-22 |
| CN107923866A (zh) | 2018-04-17 |
| CN107923866B (zh) | 2021-02-26 |
| EP3351931A4 (en) | 2019-08-14 |
| EP3351931A1 (en) | 2018-07-25 |
| EP3351931B1 (en) | 2025-10-08 |
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