GB2480719A - Electrochemical gas sensor for detecting prussic acid - Google Patents
Electrochemical gas sensor for detecting prussic acid Download PDFInfo
- Publication number
- GB2480719A GB2480719A GB1101060A GB201101060A GB2480719A GB 2480719 A GB2480719 A GB 2480719A GB 1101060 A GB1101060 A GB 1101060A GB 201101060 A GB201101060 A GB 201101060A GB 2480719 A GB2480719 A GB 2480719A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gas sensor
- electrochemical gas
- carbon nanotubes
- electrode
- electrolyte
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 title claims abstract description 37
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 50
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 50
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims abstract description 45
- 239000003792 electrolyte Substances 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 16
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 6
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 6
- 229910052794 bromium Inorganic materials 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000007790 solid phase Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 239000002048 multi walled nanotube Substances 0.000 claims description 4
- 239000010970 precious metal Substances 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 3
- 239000007772 electrode material Substances 0.000 claims description 3
- 239000008151 electrolyte solution Substances 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000002109 single walled nanotube Substances 0.000 claims description 3
- 238000004220 aggregation Methods 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000002071 nanotube Substances 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 235000010216 calcium carbonate Nutrition 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 125000002843 carboxylic acid group Chemical group 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- -1 transition metal salts Chemical class 0.000 description 2
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical class C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001508 alkali metal halide Inorganic materials 0.000 description 1
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 150000003842 bromide salts Chemical class 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 150000001734 carboxylic acid salts Chemical class 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- PSHMSSXLYVAENJ-UHFFFAOYSA-N dilithium;[oxido(oxoboranyloxy)boranyl]oxy-oxoboranyloxyborinate Chemical compound [Li+].[Li+].O=BOB([O-])OB([O-])OB=O PSHMSSXLYVAENJ-UHFFFAOYSA-N 0.000 description 1
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 description 1
- 239000002079 double walled nanotube Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910003472 fullerene Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
-
- 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
- G01N27/308—Electrodes, e.g. test electrodes; Half-cells at least partially made of carbon
-
- 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
- G01N27/403—Cells and electrode assemblies
-
- 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
- G01N27/403—Cells and electrode assemblies
- G01N27/404—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors
- G01N27/4045—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors for gases other than oxygen
-
- 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
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4073—Composition or fabrication of the solid electrolyte
- G01N27/4074—Composition or fabrication of the solid electrolyte for detection of gases other than oxygen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Crystallography & Structural Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
An electrochemical gas sensor 1 for the detection of prussic acid (HCN) in a gas sample comprises a housing 2, measuring electrode 3 of carbon nanotubes (CNT) and a counter-electrode 8 in an electrolyte 9, which comprises lithium bromide (LiBr) in aqueous solution. Electrodes 3, 8 and reference electrode 6 are connected to potentiostat 16 which measures the potential at measuring electrode 3.
Description
Electrochemical gas sensor for, and method of, detecting prussic acid The invention relates to an electrochemical gas sensor for, and a method of, detecting prussic acid.
A gas sensor for determining 502 or H2S, which contains a measuring electrode comprising carbon nanotubes, is known from DE 10 2006 014 713 B3. The electrolyte contains a mediator compound based on transition metal salts with which a selective determination of the desired gas component is possible.
Mediator compounds are compounds which comprise, apart from at least one acid group, at least one further group selected from hydroxy and acid groups. In particular, the mediator compound is a carboxylic acid salt which comprises, apart from the one carboxylic acid group, at least one hydroxy group, preferably at least two hydroxy groups, and/or at least one further carboxylic acid group. Suitable compounds are also tetraborates, such as sodium tetraborate or lithium tetraborate. Transition metal salts, in particular Cu salts of such mediators, permit a selective determination of SO2.
A measuring device described in US 2005/0230 270 Al contains a microelectrode arrangement of carbon nanotubes for detecting substances in liquid or gaseous samples.
An electrochemical gas sensor is known from DE 199 39 011 Cl, the measuring electrode whereof is made from diamond-like carbon. An aqueous lithium bromide, which at the same time acts as a mediator, is used as the electrolyte. The mediator function is based here on the oxidation of lithium bromide to form bromine through the chlorine gas to be measured. The potential at the measuring electrode is adjusted such that bromine is reduced at the measuring electrode.
The present invention seeks to provide an electrochemical gas sensor for, and a method of, detecting a prussic acid.
The present invention, in a first aspect, is an electrochemical gas sensor for the detection of prussic acid in a gas sample which comprising a measuring electrode containing carbon nanotubes (CNT) and a counter-electrode in an electrolyte solution comprising lithium bromide.
The present invention, in a second aspect, is a method for the detection of prussic acid with an electrochemical gas sensor which comprises a measuring electrode of carbon nanotubes (CNT) and an aqueous LiBr solution as an electrolyte, in which the potential at the measuring electrode is adjusted in such a way that dissolved bromine is present in the electrolyte for the detection reaction.
The present invention, in a second aspect, is the use of an electrochemical gas sensor comprising a measuring electrode of carbon nanotubes (CNT) and a counter-electrode in an electrolyte, which contains lithium bromide, for the detection of prussic acid.
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying figure 1 which is a schematic cross-sectional view of a gas sensor according to the present invention.
Surprisingly, it has been shown that prussic acid can be detected with a high degree of sensitivity using a measuring electrode comprising carbon nanotubes (CNT) in combination with an aqueous electrolyte containing lithium bromide, wherein the temperature and humidity changes have only a subordinate effect on the measurement signal. Although it is already known to use an electrode made from diamond-like carbon in combination with an aqueous electrolyte of lithium bromide, it has surprisingly emerged that prussic acid can be detected solely in combination with a measuring electrode of carbon nanotubes (CNT). The potential at the measuring electrode must be adjusted for the detection reaction in such a way that bromine is present freely dissolved in the electrolyte through oxidation of the lithium bromide. The operating point has to be set such that a sensor base current as low as possible is present Measuring electrodes produced from carbon nanotubes (CNT) are long-term stable and easy to integrate into existing sensor designs. Carbon nanotubes have a structural affinity with the fullerenes, which can be produced for example by evaporation of carbon by a laser evaporation process. A single-wall carbon nanotube has, for example, a diameter of one nanometre and a length of approximately a thousand nanometres. Apart from single-wall carbon nanotubes, double-wall carbon nanotubes (DW CNT) and structures with multiple walls (MW CNT) are also known.
In the case of measuring electrodes comprising carbon nanotubes (CNT), the layer thickness of the electrode material in the finished electrode lies in a range between 0.5 microns and 500 microns, preferably 10 to 50 microns.
Multi-wall carbon nanotubes (MW CNT) in particular produce a particularly high measurement signal and are a particularly preferred embodiment.
For production-related reasons, carbon nanotubes are provided with metal atoms, e.g. Fe, Ni, Co including their oxides, so that such carbon nanotubes on measuring electrodes possess catalytic activities. It has proved to be advantageous to remove these metal particles by acid treatment.
The carbon nanotubes are expediently deposited on a porous carrier, a non-woven fabric material or a diffusion membrane. The carbon nanotubes are joined together in self-aggregation or with a binder. PTFE powder can expediently be used as a binder.
It is particularly advantageous to produce the carbon nanotubes from a prefabricated film, a so-called bucky paper. The measuring electrode can then be stamped directly out of the bucky paper. Large piece numbers can thus be produced cost effectively.
The measuring cell comprises openings which are provided with a membrane permeable to the analytes and otherwise close the measuring cell to the exterior. The electrochemical cell contains at least one measuring electrode and a counter-electrode, which can be disposed coplanar, plane-parallel or radially with respect to one another and which are each formed in a two-dimensionally extending manner. A reference electrode can also be present in addition to the counter-electrode.
Located between the plane-parallel electrodes is a separator, which holds the electrodes at a distance from one another and which is saturated with the electrolyte.
As electrode materials in the case of the reference electrode, use may be made of precious metals such as platinum or iridium, carbon nanotubes or an electrode of a 2' kind, which is made from a metal which is in equilibrium with a sparingly soluble metal salt.
The counter-electrode is expediently made from a precious metal, e.g. gold, platinum, iridium, or carbon nanotubes.
Hygroscopic alkali or alkaline-earth metal halides, preferably bromides, in aqueous solution are preferably used as conductive electrolytes. The pH value of the electrolyte is preferably stabilised with a buffer. Particularly advantageous formulations are an aqueous LiBr solution or an aqueous LiBr solution with saturated calcium carbonate CaCO3 as a solid phase at the bottom.
Calcium carbonate serves as a pH stabiliser for the electrolyte solution. As an alternative to calcium carbonate, other alkaline-earth carbonates are also suitable as pH stabilisers, such as magnesium carbonate or barium carbonate, which are expressly also included in the scope of protection.
An advantageous use of an electrochemical gas sensor comprising a measuring electrode of carbon nanotubes (CNT) and a counter-electrode in an electrolyte, which contains lithium bromide, consists in the detection of prussic acid in a gas sample. Multi-wall carbon nanotubes (MW CNT) are a preferred material for the measuring electrode. Particularly preferred electrolytes are an aqueous LiBr solution or an aqueous LiBr solution with saturated CaCO3 as a solid phase at the bottom.
A method according to the invention for the detection of prussic acid with an electrochemical gas sensor, which comprises a measuring electrode of carbon nanotubes (CNT) and an aqueous LiBr solution as an electrolyte, consists in the fact that the potential at the measuring electrode is adjusted in such a way that dissolved bromine is present in the electrolyte for the detection reaction.
Referring particularly to figure 1, a gas sensor 1 is shown, wherein there are arranged in sensor housing 2 a measuring electrode 3 of carbon nanotubes (CNT), on a diffusion membrane 4, a reference electrode 6 in a core 7 and a counter-electrode 8. The interior of sensor housing 2 is filled with an electrolyte 9 comprising an aqueous LiBr solution, wherein a pH stabiliser of calcium carbonate is additionally present as a solid phase at the bottom 10. Electrodes 3, 6, 8 are held at a fixed distance from one another by means of liquid-permeable non-woven fabrics 11, 12, 13. The gas admission takes place through an opening 15 in sensor housing 2. Gas sensor 1 is connected in a known manner to a potentiostat 16 with which the potential at measuring electrode 3 and also the operating point for the sensor base current are set.
Claims (17)
- Claims 1. An electrochemical gas sensor for the detection of prussic acid in a gas sample, comprising a measuring electrode containing carbon nanotubes (CNT) and a counter-electrode in an electrolyte solution comprising lithium bromide.
- 2. The electrochemical gas sensor according to claim 1, in which the carbon nanotubes are located on a porous carrier, a non-woven fabric material or a diffusion membrane.
- 3. The electrochemical gas sensor according to any one of claims 1 or 2, in which the nanotubes are joined together by self-aggregation or with the aid of a binder.
- 4. The electrochemical gas sensor according to claim 3, in which the binder is PTFE.
- 5. The electrochemical gas sensor according to any one of claims ito 4, in which the carbon nanotubes are present as a film in the form of a so-called bucky paper.
- 6. The electrochemical gas sensor according to any one of claims ito 5, in which the carbon nanotubes are present in the form of single-wall or multi-wall carbon nanotubes (MW CNT) with a layer thickness of the finished electrode material between 0.5 microns and 500 microns, preferably 10 to 50 microns.
- 7. The electrochemical gas sensor according to any one of claims 1 to 6, in which the counter-electrode is made of a precious metal, e.g. gold, platinum, iridium or carbon nanotubes.
- 8. The electrochemical gas sensor according to any one of claims 1 to 7, further including a reference electrode which is made of a precious metal, carbon nanotubes or an electrode of a second kind, the electrode of the second kind being a metal which is in equilibrium with a sparingly soluble metal salt.
- 9. The electrochemical gas sensor according to any one of claims 1 to 8, in which the electrolyte is present as an aqueous electrolyte.
- 10. The electrochemical gas sensor according to any one of claims 1 to 9, in which the electrolyte is an aqueous LiBr solution or an aqueous LiBr solution with saturated CaCO3 as a solid phase at the bottom.
- 11. A method for the detection of prussic acid with an electrochemical gas sensor which comprises a measuring electrode of carbon nanotubes (CNT) and an aqueous LiBr solution as an electrolyte, in which the potential at the measuring electrode is adjusted in such a way that dissolved bromine is present in the electrolyte for the detection reaction.
- 12. Use of an electrochemical gas sensor comprising a measuring electrode of carbon nanotubes (CNT) and a counter-electrode in an electrolyte, which contains lithium bromide, for the detection of prussic acid.
- 13. The use according to claim 12, in which the carbon nanotubes are present as multi-wall carbon nanotubes (MW CNT).
- 14. The use according to claim 12 or 13, in which an aqueous LiBr solution or an aqueous LiBr solution with saturated CaCO3 as a solid phase at the bottom (10) is present as an electrolyte (9).
- 15. An electrochemical gas sensor for the detection of prussic acid in a gas sample substantially as hereinbefore described with reference to, and/or as shown in, the accompanying figure.
- 16. A method for the detection of prussic acid with an electrochemical gas sensor substantially as hereinbefore described with reference the accompanying figure.
- 17. The use of an electrochemical gas sensor for the detection of prussic acid in a gas sample substantially as hereinbefore described with reference to the accompanying figure
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1101060.0A GB2480719B (en) | 2010-05-28 | 2011-01-21 | Electrochemical gas sensor for, and method of, detecting prussic acid |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010021975.4A DE102010021975B4 (en) | 2010-05-28 | 2010-05-28 | Electrochemical gas sensor and use of an electrochemical gas sensor for the detection of hydrocyanic acid |
| GB1101060.0A GB2480719B (en) | 2010-05-28 | 2011-01-21 | Electrochemical gas sensor for, and method of, detecting prussic acid |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201101060D0 GB201101060D0 (en) | 2011-03-09 |
| GB2480719A true GB2480719A (en) | 2011-11-30 |
| GB2480719B GB2480719B (en) | 2012-10-24 |
Family
ID=43769410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1101060.0A Active GB2480719B (en) | 2010-05-28 | 2011-01-21 | Electrochemical gas sensor for, and method of, detecting prussic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2480719B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2292805A (en) * | 1994-08-26 | 1996-03-06 | Mil Ram Techn Inc | Electrochemical cell for detecting toxic gas |
| GB2353363A (en) * | 1999-08-17 | 2001-02-21 | Draegerwerk Ag | Electrochemical gas sensor with diamond-like carbon measuring electrode |
| WO2005034204A2 (en) * | 2003-09-30 | 2005-04-14 | Nano-Proprietary, Inc. | Nanobiosensor and carbon nanotube thin film transistors |
| EP1706130A2 (en) * | 2003-12-15 | 2006-10-04 | Nano-Proprietary, Inc. | Matrix array nanobiosensor |
| GB2436695A (en) * | 2006-03-30 | 2007-10-03 | Draegerwerk Ag | Electrochemical gas sensor with measuring electrode containing carbon nanotubes |
| GB2444136A (en) * | 2006-11-22 | 2008-05-28 | Draegerwerk Ag | Electrochemical gas sensor including electrical connecting conductors or housing connection-making links made from carbon nanotubes |
-
2011
- 2011-01-21 GB GB1101060.0A patent/GB2480719B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2292805A (en) * | 1994-08-26 | 1996-03-06 | Mil Ram Techn Inc | Electrochemical cell for detecting toxic gas |
| GB2353363A (en) * | 1999-08-17 | 2001-02-21 | Draegerwerk Ag | Electrochemical gas sensor with diamond-like carbon measuring electrode |
| WO2005034204A2 (en) * | 2003-09-30 | 2005-04-14 | Nano-Proprietary, Inc. | Nanobiosensor and carbon nanotube thin film transistors |
| EP1706130A2 (en) * | 2003-12-15 | 2006-10-04 | Nano-Proprietary, Inc. | Matrix array nanobiosensor |
| GB2436695A (en) * | 2006-03-30 | 2007-10-03 | Draegerwerk Ag | Electrochemical gas sensor with measuring electrode containing carbon nanotubes |
| GB2444136A (en) * | 2006-11-22 | 2008-05-28 | Draegerwerk Ag | Electrochemical gas sensor including electrical connecting conductors or housing connection-making links made from carbon nanotubes |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201101060D0 (en) | 2011-03-09 |
| GB2480719B (en) | 2012-10-24 |
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