JP2009047710A - Detection method of chemical - Google Patents

Abstract

[PROBLEMS] To detect a chemical agent suitable for use in detecting sulfur mustard and leucite 1 having specifications as a speed of detecting a chemical agent, reducing a false alarm rate, narrowing down the type of chemical agent, and an unmanned continuous monitoring device. An apparatus and a detection method are obtained.
A detection apparatus includes a sample introduction unit 1 that takes in a sample and heats it, an ionization unit 2 that ionizes a sample from the sample introduction unit 1, a mass analysis unit 3, and a computer 6 that analyzes data. The When a predetermined signal peculiar to sulfur mustard and lewisite 1 is recognized by the computer 6, the sample can be specified.
[Selection] Figure 1

Description

  The present invention relates to a method for detecting chemical agents, and in particular, 2,2′-Dichloroethyl sulphide (hereinafter referred to as sulfur mustard), 2-Chlorovinyldichloroarsine (hereinafter referred to as Louis) using a mass spectrometer, atmospheric pressure chemical ionization (APCI). The present invention relates to a method for detecting a chemical agent suitable for use in detecting a site 1).

  In recent years, a detection device for detecting a chemical agent has been demanded for countermeasures against chemical terrorism such as the Sarin incident. The chemical agent detection is generally performed by analyzing the chemical agent, and inspection by gas chromatography mass spectrometry (GC / MS) is mainly used. Usually, the chemical agent itself is rarely detected from the sample, and the presence of the chemical agent is proved by detecting a decomposition product having high persistence.

  Further, liquid chromatography mass spectrometry (LC / MS) for separating and analyzing volatile or nonvolatile compounds is known as a prior art of other analyzers for analyzing chemical agents.

  FIG. 14 is a diagram for explaining a schematic configuration of an analyzer using liquid chromatography mass spectrometry according to the prior art. Hereinafter, the analyzer according to the prior art will be described. In FIG. 14, 101 is a liquid chromatograph (LC), 102 is a connecting tube, 103 is an ion source, 104 is an ion source power source, 105 and 109 are signal lines, 106 is a mass analyzer, 107 is a vacuum system, and 108 is an ion. A detector 110 is a data processing unit.

  As shown in FIG. 14, an analyzer using liquid chromatography mass spectrometry according to the prior art is derived from sample molecules controlled by a liquid chromatograph (LC) 101 that separates a sample solution into components and an ion source power source 104. An ion source 103 that generates ions to be generated, a mass analyzer 106 that is evacuated by a vacuum system 107 and analyzes the mass of the generated ions, an ion detector 108 that detects the analyzed ions, and data. It is comprised by the data processing part 110 to process. A portion including the ion source 103, the mass analyzer 106, and the ion detector 108 constitutes a mass spectrometer (MS).

  In the above description, the sample solution separated for each component by the liquid chromatograph (LC) 101 is guided to the ion source 103 that operates under atmospheric pressure through the connection tube 102. The ion source 103 is controlled through a signal line 105 by an ion source power source 104, and generates ions derived from sample molecules in the sample solution. Subsequently, the generated ions are introduced into the mass analyzer 106 and subjected to mass analysis. The mass analyzer 106 is evacuated by a vacuum system 107. The ions subjected to mass analysis are detected by the ion detector 108. The detected signal is sent to the data processing unit 110 via the signal line 109 and gives analysis data such as a mass spectrum and a chromatograph.

  Since the mass spectrometer of the analyzer configured as described above needs to handle ions in a vacuum, it requires an interface means with the liquid chromatograph (LC) 101. That is, the LC is a device that handles a large amount of water and an organic solvent under atmospheric pressure, whereas the MS is a device that handles ions under a high vacuum. For this reason, it has been difficult to directly couple the two.

  In addition, a system called IMS is a system that measures mobility in an electric field mainly in combination with ionization of a sample by a radiation source, and is a mainstream for on-site detection, and there are many product groups in Europe and the United States. The IMS system is widely used including military specifications because it can be made smaller than GC / MS and LC / MS. However, because IMS does not determine the sample by m / z (ion mass number / ion valence), if the detection display is rough and the alarm sounds, the soldier should wear a protective mask. Carrying on mobile.

As a conventional technique related to the IMS method, for example, a technique described in Patent Document 1 is known.
US Pat. No. 6,225,623 B1

  The prior art described above has the following problems. The technique of electron ionization (EI) tends to decompose a detection object in order to give a strong energy to the detection object itself. In the detection device using GC / MS, it is difficult to monitor ions exceeding the molecular weight of the detection object, and it is difficult to specify the sample. The GC or LC process for separating the detected object lengthens the detection time.

  The IMS method cannot identify the type of chemical agent, but has a problem that it is difficult to determine a detection sample and the false alarm rate is high because it reacts with a wide range of compounds. As described above, in the IMS system, it is difficult to specify a sample and the false alarm rate is high at present.

  The object of the present invention is to solve the problems of the prior art as described above, the speed of detecting chemical agents, the reduction of false alarm rate, the narrowing down of the types of chemical agents, and the sulfur as a specification for an unattended continuous monitoring device. An object of the present invention is to provide a chemical agent detection method suitable for use in detection of mustard and lewisite 1.

  According to the present invention, the object is to detect a sample by taking a test sample and negatively ionizing a gas generated by heating the test sample to 110 ° C. to 180 ° C. by corona discharge, and mass analyzing the generated ions. This is achieved by detecting a signal derived from the chemical agent to be obtained.

  According to the present invention, the test sample is aspirated and the m / z is confirmed by the analysis unit of the detection apparatus [atmospheric pressure chemical ionization (APCI) -mass spectrometer (MS)]. The presence or absence can be easily confirmed.

  Hereinafter, embodiments of a chemical agent detection method according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a detection apparatus for detecting a chemical agent according to an embodiment of the present invention. In FIG. 1, 1 is a sample introduction unit, 2 is an ionization unit, 3 is a mass analysis unit, 4 is a control unit, 5 is a suction pump, 6 is a computer for measurement processing, 7 is a vacuum pump, and 16 is a sample.

  As shown in FIG. 1, a chemical agent detection apparatus according to an embodiment of the present invention includes a sample introduction unit 1, an ionization unit 2 that is an ion source, a mass analysis unit 3, a control unit 4, a suction pump 5, and a measurement processing computer. 6. A vacuum pump 7 is provided. In the chemical agent detection apparatus configured as described above, the sample 16 to which the fine particles of the dangerous substance inserted into the sample introduction unit 1 are attached is heated by a heating mechanism (not shown) provided in the sample introduction unit 1 to become a gas. . The gas sample is guided to the ionization unit 2 by an atmospheric flow 81 shown by a thick line in the drawing drawn by the suction pump 5. The suction pump 5 has a function of exhausting the sucked air and a function of making the suction amount variable between 0 liter and 2 liters / minute by a mass flow controller.

  The inspection sample introduced into the ionization unit 2 that is an ion source is sent to a corona discharge region at the tip of a corona discharge needle electrode, which will be described later, and is subjected to a positive high voltage (about 2 kV to 5 kV) applied to the needle electrode. Depending on the component, it is positively ionized. Only positively ionized components are guided to the electric field applied from the ionization unit 2 to the mass analysis unit 3, pass through the first pores provided in the ionization unit 2, and are guided to the mass analysis unit 3. Is done. At this time, surplus substances other than ions and molecules passing through the first pores in the ionization unit 2 are discharged to the outside of the ionization unit 2 by the suction pump 5 and then exhausted to the outside of the apparatus. Further, by keeping the sample introduction path between the sample introduction section 1 and the ionization section 2 and the ionization section 2 at a high temperature, the adsorption of the sample to the inner wall of the introduction path or the inside of the ionization section 2 can be prevented.

  The ions induced in the mass analysis unit 3 pass through the differential exhaust unit in the mass analysis unit 3 decompressed by the vacuum pump 7, are converged by the electrostatic lens system, and are analyzed by the mass spectrometer. . The vacuum pump 7 also has a function of keeping the inside of the chamber containing the mass spectrometer in a high vacuum state. The ions taken out by the mass spectrometer are converted into electrons by the secondary electron multiplier in the mass analyzer 3, and the obtained current signal is amplified by the amplification amplifier, and then is sent to the measurement processing computer 6. Sent.

  The measurement processing computer 6 processes the signal input from the mass analysis unit 3, and the relationship between the mass number / charge (m / z) and the ion intensity (mass spectrum) or the time change of the ion intensity at a certain m / z. (Mass chromatogram) etc. are displayed. The final display may be further simplified instead of the above-described mass spectrum or mass chromatogram. That is, when the chemical agent detection apparatus according to the embodiment of the present invention is used as a dangerous substance detection apparatus, it may be only necessary to display whether or not a problematic chemical agent is detected.

  The control unit 4 performs ON / OFF control, temperature / voltage / vacuum pressure setting, status monitoring, and the like of each functional unit constituting the detection device. These connections are indicated by control signals and data 82 indicated by thin lines in FIG.

  As described above, according to the embodiment of the present invention, it is possible to analyze the particulate matter of the dangerous substance attached to the sample 16 inserted in the sample introduction unit 1 by the mass analysis unit 3.

  FIG. 2 is a perspective view showing an appearance of the detection device according to the embodiment of the present invention. As shown in FIG. 2, the detection device includes a filter paper heating unit 21 having a filter paper insertion port 20, an analysis unit 22, and a display unit 23, and can be moved by wheels arranged at the lower part of the device.

  Usually, in the process of preparing a chemical agent or transporting a chemical agent, it adheres to a very small amount of chemical agent or the hand, skin, clothes, etc. of the person handling the chemical agent. When this person handles personal items such as bags, chemical agents will also adhere to these personal items.

  Therefore, the embodiment of the present invention is a clean and soft material such as cloth or filter paper (hereinafter referred to as a test paper, but the material is not necessarily paper) and is an inspection target (detection target). The surface of the bag is wiped off, and the chemical agent attached to the test paper is analyzed. That is, the test paper to which the chemical agent is attached is inserted into the filter paper heating unit 21 through the filter paper insertion port 20. Since the test paper is heated by the filter paper heating unit 21, the chemical substance adhering to the test paper is vaporized and analyzed by the analysis unit 22. The analysis unit 22 is provided with a database in which the detection device having the configuration described with reference to FIG. And when it is recognized from the analyzed result and the information registered in the database that a predetermined signal specific to the chemical agent is detected, the measurement processing computer 6 displays an alarm on the display unit 23.

  FIG. 3 is a cross-sectional view showing a configuration example of the filter paper heating unit (oven) 21 shown in FIG. In FIG. 3, 24 is a filter paper, 25 is a tray, 25 'is a handle, 26 is a tray holder, 27 is a sensor, 28 is a halogen lamp, 29 is an air intake tube, 30 is a filter, 31 is a sample introduction tube, and 32 is a cover. It is.

  The filter paper heating unit (oven) 21 includes a tray holder 26, a halogen lamp 28 as a heat source provided in the tray holder 26, and a tray 25 on which the filter paper 24 is placed. In such a filter paper heating unit 21, first, filter paper 24, which is a test paper from which an inspection object is wiped, is placed on a slide type tray 25. The tray 25 on which the filter paper 24 is placed is inserted into the tray holder 26. When the sensor 27 detects that the tray 25 has been pushed into a predetermined position, a halogen lamp 28 provided on the top of the tray holder 26 is turned on. The filter paper 24 is heated by the heat rays from the halogen lamp 28, and the material adhering to the filter paper 24 is vaporized. The heating temperature is desirably 100 ° C. or higher. The sample generated from the filter paper 24 is sent to the analysis unit 22 through the sample introduction tube 31 together with the air taken in from the air intake tube 29.

  The air intake tube 29 may be provided with a filter 30 for removing dust and the like, and the filter paper heating unit 21 is heated to a high temperature. Therefore, a heat-insulated cover 32 and a handle 25 'are provided for safety. Good. Further, as the sample introduction unit 1, a test sample (detected object) sucked from the outside may be directly introduced into the ionization unit 2.

  FIG. 4 is a block diagram illustrating a configuration example of the ionization unit and the mass analysis unit of the detection device according to the embodiment of the present invention. In FIG. 4, 33 is a needle electrode, 34 is a counter electrode, 35 is an opening, 36 is a suction pump, 37a and 37b are electrodes with pores, 38a is a first ion introduction pore, and 38b is a second ion introduction. Pore, 39 is a differential exhaust part, 40a and 40b are exhaust systems, 41 is a vacuum part, 42a and 42b are end cap electrodes, 43 is an ion focusing lens, 44 is a ring electrode, 45 is a quartz ring, 46 is a gas supply , 47 is a gas introduction pipe, 48 is a gate electrode, 49 is a conversion electrode, 50 is a scintillator, 51 is a photomultiplier, and 52 is a data processing device.

  In FIG. 4, a needle electrode 33 is arranged in the ionization unit 2, and a high voltage is applied between the counter electrode 34. As a result, a corona discharge is generated near the tip of the needle electrode 33, and nitrogen, oxygen, water vapor, and the like are first ionized. These ions are called primary ions. The primary ions move to the counter electrode 34 side by an electric field. The inspection sample supplied from the sample introduction part supplied between the counter electrode 34 and the electrode 37a with the pores via the sample introduction pipe 31 is opened by the suction pump 36 in the counter electrode 34 of the ionization part 2. It flows to the needle electrode 33 side through 35 and is ionized by reacting with primary ions.

  There is a potential difference of about 1 kV between the counter electrode 34 and the apertured electrode 37a, and ions move in the direction of the apertured electrode 37a and are taken into the differential exhaust part 39 through the aperture 38a. In the differential exhaust part 39, adiabatic expansion occurs, and so-called clustering in which solvent molecules or the like adhere to ions occurs. In order to reduce clustering, it is desirable to heat the electrodes 37a and 37b with pores with a heater or the like.

  When the ionization part 2 having the structure shown in FIG. 4 is used, the primary ions generated by the corona discharge move in the direction of the counter electrode 34 due to the potential difference between the needle electrode 33 and the counter electrode 34, and the opening part It moves to the direction of the electrode 37a with a hole through 35. Since the inspection sample from the sample introduction part is supplied between the counter electrode 34 and the electrode 37a with a pore, a reaction between the primary ions and the inspection sample occurs. Neutral molecules and the like generated by the corona discharge flow from the counter electrode 34 to the needle electrode 33 by the suction pump 36, and thus are removed from the corona discharge portion. Further, in the region where the ionization reaction between the primary ions and the sample occurs. Difficult to flow. In this way, by separating the primary ion generation region by corona discharge from the ionization reaction region of the primary ions and the sample, ionization is prevented by preventing radical neutral molecules generated by corona discharge from flowing into the ionization region. Sample degradation in the region can be reduced.

As described above, in the embodiment of the present invention, primary ions are generated using corona discharge in the atmosphere, and the test sample is ionized using a chemical reaction between the primary ions and the test sample. This method is called atmospheric pressure chemical ionization. In the case of sulfur mustard, a positive ionization mode in which positive high voltage is applied to the needle electrode 33 to generate positive ions is used. In this case, the primary ions are often water molecule ions [(H ₂ O) ⁺ ]. A typical positive ionization reaction formula is as follows: when M is a molecule to be detected and H is a hydrogen atom,
M + (H ₂ O) ⁺ → M ⁺ + (H ₂ O), M ⁺ + H → (M + H) ⁺
It can be expressed as.

In the case of the lewisite 1, a negative ionization mode in which a negative high voltage is applied to the needle electrode 33 to generate negative ions is used. In this case, the primary ion is often an oxygen molecule ion [(O ₂ ) ⁻ ]. A typical negative ionization reaction is shown below. In the following formula, M represents a molecule in the gas.

M + (O ₂ ) ⁻ → (M) ⁻ + O ₂
It can be expressed as.

  The ions generated as described above are the first ion introduction pore 38a that opens to the electrode 37a with the pore, the differential exhaust part 39 that is exhausted by the exhaust system 40a, and the first opening that opens to the electrode 37b with the pore. 2 is introduced into the vacuum part 41 exhausted by the exhaust system 40b through the ion introduction pores 38b. A voltage called a drift voltage is applied between the apertured electrodes 37a and 37b. This drift voltage has the effect of improving the ion transmittance of the ion introduction pore 38b by drifting the ions taken into the differential exhaust portion 39 in the direction of the second ion introduction pore 38b. By causing the gas molecules remaining in the portion 39 to collide with ions, there is an effect of desorbing solvent molecules such as water adhering to the ions. A voltage is further applied to the electrode 37b with pores. This voltage affects the energy (incident energy) when ions pass through the opening provided in the end cap electrode 42a.

  Since the ion confinement efficiency of the ion trap mass analyzer used in the embodiment of the present invention depends on the incident energy of ions, the aforementioned voltage is set so that the confinement efficiency becomes high. The ions introduced into the vacuum part 41 are converged by the ion focusing lens 43 and then introduced into an ion trap mass spectrometer constituted by the end cap electrodes 42 a and 42 b and the ring electrode 44. The end cap electrodes 42 a and 42 b and the ring electrode 44 are held by a quartz ring 45.

  A collision gas such as helium is introduced into the mass spectrometer from a gas supply unit 46 through a gas introduction pipe 47. The gate electrode 48 is provided to control the timing of ion incidence to the ion trap mass analyzer. Ions that have been subjected to mass analysis and discharged out of the mass analyzer are detected by a detector that includes a conversion electrode 49, a scintillator 50, and a photomultiplier 51. The ions collide with the conversion electrode 49 to which a voltage for accelerating the ions is applied. Charged particles are emitted from the surface of the conversion electrode 49 by the collision of the ions with the conversion electrode 49. The charged particles are detected by the scintillator 50, and the signal is amplified by the photomultiplier 51. The detected signal is sent to the data processing device 52. In the above description, the ion trap mass analyzer is used as the mass analyzer. However, a quadrupole mass analyzer may be used as the mass analyzer.

  The data processor 52 identifies the chemical agent to be detected, for example, positive ions having m / z derived from sulfur mustard, and in the case of leucite 1, identifies negative ions having m / z derived from leucite 1. Then, by obtaining the signal intensity, it is tested whether or not the sulfur mustard and leucite 1 which are chemical agents to be detected are detected. When the sulfur mustard and lewisite 1 are detected, the data processing device 52 displays an alarm on the display unit 23 and what is detected. This alarm display may be performed by generating a high tone or flashing a red warning light to attract attention.

  FIG. 5 is a diagram for explaining a mass spectrum of sulfur mustard obtained by the above-described embodiment of the present invention. This example is an example in which sulfur mustard vapor is directly introduced into the sample introduction section, and positive ion detection, drift voltage 50 V, ionization section temperature 150 ° C., and sample introduction section temperature 180 ° C. are set.

As shown in FIG. 5, in this example, signals of m / z = 123 and 158 were detected. Since sulfur mustard has a molecular weight M _HD = 158, 160, m / z = 123 is a signal of (M _HD -Cl) ⁺ and m / z = 158 is a signal of (M _HD ) ⁺ . is there. That is, when both signals of m / z = 123 and 158 are detected, sulfur mustard is detected. This detection method can reduce the false alarm rate. If another component accidentally gives a signal of m / z = 123 (or 158) and only m / z = 123 (or 158) is detected, it may be a false alarm if sulfur mustard is detected. .

  6-7 is a figure explaining the temperature dependence of the signal of m / z = 123,158 detected by introduce | transducing sulfur mustard as a sample, The example shown in FIG. It is a time change of the ionic strength signal amount when the sulfur mustard gas at the ion source 110 ° C. is sucked for a certain time to stop sucking. The sample introduction part was constituted by a SUS pipe with a temperature adjustment function. The example shown in FIG. 7 is the time change of the ion intensity signal amount when the sulfur mustard gas at the sample introduction part 180 ° C. and the ion source 150 ° C. is sucked for a certain time to stop sucking. The sample introduction part was constituted by a SUS pipe with a temperature adjustment function.

  By setting the sample introduction part and the ion source at a high temperature, the adsorption is reduced and the arrival of the sulfur mustard gas to the ion source may be accelerated. This is effective in shortening the signal rise time from gas suction until signal detection and shortening the fall time in which the signal level returns to the background level after the gas suction is stopped.

  FIG. 8 is a diagram for explaining the drift voltage dependency of a signal of m / z = 123 detected by introducing sulfur mustard as a sample. As can be seen from this figure, a signal larger than the background can be obtained when the drift voltage exceeds 40V and reaches 80V. The background is the signal level of m / z = 123 when no sample of sulfur mustard is introduced. A signal greater than background is monitored to determine if sulfur mustard has been detected. Therefore, a larger signal amount can be obtained by setting the drift voltage between 50V and 80V.

  FIG. 9 is a diagram for explaining the mass spectrum of the lewisite 1 obtained by the above-described embodiment of the present invention. This example is an example in which the vapor of Louisite 1 is directly introduced into the sample introduction part, and negative ion detection, drift voltage −40 V, ionization part temperature 180 ° C., and sample introduction part temperature 180 ° C. are set. .

As shown in FIG. 9, in this example, signals of m / z = 187 and 205 were detected. Since leucite 1 has a molecular weight M _L = 206, 208, m / z = 205 is a signal of (ML−H) ⁻ , and m / z = 187 is a signal of a decomposition product of leucite 1. It is. That is, it is assumed that Louisite 1 is detected when both signals m / z = 187 and 205 are detected. This detection method can reduce the false alarm rate. When another component accidentally gives a signal of m / z = 187 (or 205) and only m / z = 187 (or 205) is detected, it may be falsely reported that Louisite 1 is detected. is there.

  10 to 12 are diagrams for explaining the temperature dependency of signals of m / z = 187 and 205 detected by introducing the leucite 1 as a sample. The example shown in FIG. 10 shows the time change of the ion intensity signal amount when the sample introduction part is 30 ° C. and the ion source is 110 ° C., and the Louisite 1 gas is sucked for a certain period of time to stop the suction. The sample introduction part was composed of Teflon (registered trademark) piping. The example shown in FIG. 11 shows the time change of the ion intensity signal amount when the sample introduction part is 110 ° C. and the ion source is 110 ° C., and the suction is stopped by sucking the Lewisite 1 gas for a certain period of time. The sample introduction part was constituted by a SUS pipe with a temperature adjustment function. The example shown in FIG. 12 shows the time change of the ion intensity signal amount when the sample introduction unit is 180 ° C. and the ion source is 150 ° C., and the Louisite 1 gas is sucked for a certain time to stop sucking. The sample introduction part was constituted by a SUS pipe with a temperature adjustment function.

  By setting the sample introduction part and the ion source at a high temperature, the adsorption may be reduced and the arrival of the sulfur mustard to the ion source may be accelerated. This is effective in shortening the signal rise time from gas suction until signal detection and shortening the fall time in which the signal level returns to the background level after the gas suction is stopped.

  FIG. 13 is a diagram for explaining the drift voltage dependence of signals of m / z = 187 and 205 detected by introducing the leucite 1 as a sample. As can be seen from this figure, a signal larger than the background can be obtained when the drift voltage is between −30V and −60V. The background is the signal level of m / z = 187,205 when the sample of Louisite 1 is not introduced. A signal larger than the background can be monitored to determine if Louisite 1 has been detected. Therefore, a larger signal amount can be obtained by setting the drift voltage between −30V and −60V.

It is a block diagram which shows schematic structure of the detection apparatus which detects the chemical agent by one Embodiment of this invention. It is a perspective view which shows the external appearance of the detection apparatus by embodiment of this invention. It is sectional drawing which shows the structural example of the filter paper heating part (oven) shown in FIG. It is a block diagram which shows the structural example of the ionization part of the detection apparatus by embodiment of this invention, and a mass-analysis part. It is a figure explaining the mass spectrum of the sulfur mustard obtained by embodiment of this invention. It is a figure explaining the sample introduction part temperature 110 degreeC and ion source 110 degreeC characteristic of the signal of m / z = 123,158 detected by introduce | transducing sulfur mustard as a sample. It is a figure explaining the sample introduction part temperature 180 degreeC and ion source 150 degreeC characteristic of the signal of m / z = 123,158 detected by introduce | transducing sulfur mustard as a sample. It is a figure explaining the drift voltage dependence of the signal of m / z = 123 detected by introducing sulfur mustard as a sample. It is a figure explaining the mass spectrum of the leucite 1 obtained by embodiment of this invention. It is a figure explaining the sample introduction part temperature of the signal of m / z = 187,205 detected by introducing the leucite 1 as a sample, and the ion source 110 degreeC. It is a figure explaining the sample introduction | transduction part temperature of the signal of m / z = 187,205 detected by introducing the leucite 1 as a sample, and the ion source 110 degreeC. It is a figure explaining the sample introduction part temperature of the signal of m / z = 187,205 detected by introducing the leucite 1 as a sample, and the ion source 150 degreeC. It is a figure explaining the drift voltage dependence of the signal of m / z = 187,205 detected by introducing the lewisite 1 as a sample. It is a figure explaining schematic structure of the analyzer which uses the liquid chromatography mass spectrometry by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sample introduction part 2 Ionization part 3 Mass spectrometry part 4 Control part 5 Inhalation pump 6 Measurement processing computer 7 Vacuum pump 16 Sample 20 Filter paper insertion port 21 Filter paper heating part 22 Analysis part 23 Display part 24 Filter paper 25 Tray 25 'Handle 26 Tray Holder 27 Sensor 28 Halogen lamp 29 Air intake tube 30 Filter 31 Sample introduction tube 32 Cover 33 Needle electrode 34 Counter electrode 35 Opening 36 Suction pump 37a, 37b Electrode with pore 38a First ion introduction pore 38b Second ion Introduction pore 39 Differential exhaust part 40a, 40b Exhaust system 41 Vacuum part 42a, 42b End cap electrode 43 Ion focusing lens 44 Ring electrode 45 Quartz ring 46 Gas supply 47 Gas introduction pipe 48 Gate electrode 49 Conversion electrode 50 Scintillator 51 Photo Multiply 52 the data processing device 101 liquid chromatograph (LC)
DESCRIPTION OF SYMBOLS 102 Connection tube 103 Ion source 104 Ion source power supply 105, 109 Signal line 106 Mass analysis part 107 Vacuum system 108 Ion detector 110 Data processor

Claims (1)

  A signal derived from a chemical agent to be detected by taking in a test sample and negatively ionizing a gas generated by heating the test sample to 110 ° C. to 180 ° C. by corona discharge and mass-analyzing the generated ions A method for detecting a chemical agent, characterized by detecting

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