JP2007040934A - Agent for detecting organic-phosphorus-based nerve gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detection agent for detecting organic-phosphorus-based nerve gases by color reaction. <P>SOLUTION: The detection agent is constituted by dissolving a hydrogen ion concentration indicator, for example, methyl red of 0.02 wt.%; a buffer solution of 17.5 ml; a moisturizer, for example, polyhydric alcohol such as glycerine and ethylene glycol of 15 ml; and a homogeneous catalyst for hydrogenation for hydrogenating organic-phosphorus-based nerve gases, for example, complex salts in an easily evaporable organic solvent of methanol etc. in such a way that whole quantity may be of 100 ml to acquire a color solution, impregnating filter paper made of cellulose with the color solution, and vaporizing an organic solvent. Since organic-phosphorus-based nerve gases are decomposed to generate hydrogen fluorides, which are acid components, into color reaction with a hydrogen ion indicator, it is possible to eliminate the need for a thermal cracking furnace for pretreatment, simplify a detection apparatus, and make it compact. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sensing material for detecting an organophosphorus nerve gas by a color reaction.

In order to detect organophosphorus nerve gas, for example, mustard, by color reaction, there is no appropriate reaction reagent that causes color reaction with nerve gas itself as shown in Patent Document 1, so that the test gas is 500. In order to decompose to hydrogen fluoride, which is an acidic substance, by heating to about ℃, a pyrolysis furnace is required, the structure of the detection device is complicated and large, and large electric power is required to operate the pyrolysis furnace There is inconvenience such as doing.
JP 2005-62136 A

  The present invention has been made in view of such problems, and provides a novel organophosphorus nerve gas detection material capable of detecting nerve gas with the detection material itself without requiring pretreatment. It is to be.

  In order to achieve such a problem, the present invention is configured by developing a hydrogen ion indicator, a humectant, and an agent that decomposes an organophosphorus nerve gas to generate hydrogen fluoride on a carrier.

  The organophosphorus nerve gas is decomposed to generate acidic hydrogen fluoride and react with the color of the hydrogen ion indicator, eliminating the need for a pretreatment pyrolysis furnace and simplifying and miniaturizing the detection device be able to.

Therefore, details of the present invention will be described below based on examples.
The detection material of the present invention comprises a hydrogen ion concentration indicator, for example, methyl red 0.02 wt%, a buffer solution 17.5 ml, and a moisturizer, for example, 15 ml of a polyhydric alcohol such as glycerin or ethylene glycol, and an organic phosphorus nerve gas. Homogeneous catalyst for hydrogenation, such as copper complex salt, dissolved in a readily evaporable organic solvent such as methanol so that the total amount becomes 100 ml, impregnated with filter paper made of cellulose as an organic solvent It is composed by volatilizing.

  In addition to methyl orange, methanol yellow, azaline yellow, benzyl yellow, methyl yellow, methyl red, benzyl orange, tropeoline, and bromophenol blue can be used as the hydrogen ion indicator.

  The detection material constructed in this way is cut into a tape shape and housed in a cassette case for continuous measurement, or it is molded into a piece of paper and stored in an airtight bag. It can be taken out of the bag and used for batch measurement.

  The detection material includes, for example, a detection device as shown in FIG. 1, that is, a measurement head 13 as an optical density detection means having a light emitting element 11 and a light receiving element 12, and a detection shaped in a tape shape at regular intervals. A tape transport mechanism 14 that transports the material to the region of the measurement head 13 and a suction head 16 that receives the negative pressure from the sampling pump 15 and brings the test gas into contact with the detection material S in cooperation with the measurement head 13. It is used by being loaded into a device. In addition, the code | symbol 17 in a figure shows the intermittent drive part for sending out the fixed area | region the unused area | region of the detection material S to a measurement area | region.

In this example, when air containing mustard with a concentration of about 0.1 mg / cubic meter is sucked for 30 seconds, the organophosphorus nerve gas is caused by the homogeneous catalyst for hydrogenation on the detection material,

  Hydrogen fluoride is generated by this reaction, passes from one surface of the detection material S to the other surface, and reacts with the color former carried on the detection material S. At this time, silica gel or a humectant serving as a detection material accelerates the reaction.

  When the sampling time elapses in this way and the difference between the optical density before the gas is passed is detected by the light emitting element 11 and the light receiving element 12 of the measuring head 13, the optical saturation density of the color developing solution is 27. % Of detection output could be obtained.

  In the above-described embodiments, hydrogen fluoride is generated by decomposing the organophosphorus nerve gas by the homogeneous catalyst for hydrogenation, but hydrogen ion concentration indicator which is a basic reaction reagent, for example, methyl red 02 wt%, buffer solution 17.5 ml, and moisturizer such as polyglycerin 15ml, such as glycerin and ethylene glycol, methylcellosolve 0.5ml to 10v / v% 100ml methanol etc. A coloring solution can be prepared by dissolving in an evaporable organic solvent, impregnated in a carrier such as filter paper made of cellulose, and the organic solvent can be volatilized.

  According to this embodiment, the organophosphorus nerve gas is decomposed by methyl cellosolve on the carrier to generate hydrogen fluoride, so that the reaction reagent undergoes a color reaction with hydrogen fluoride.

  Sodium hydroxide and diethylenetriamine are also known to decompose organophosphorus nerve gases to generate hydrogen fluoride, but these sodium hydroxide and diethylenetriamine are both strongly basic substances, so It was confirmed that the pH of the reagent was changed and it was impossible to cause a color reaction with hydrogen fluoride, which was inappropriate as an agent for detecting organophosphorus nerve gas.

It is a block diagram which shows one Example of the detection apparatus suitable for the detection material of this invention.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 11 Light emitting element 12 Light receiving element 13 Measuring head 14 Tape conveyance mechanism 15 Sampling pump 16 Suction head 17 Intermittent drive part S Detection material

Claims (5)

  An organophosphorus nerve gas detection material comprising a hydrogen ion indicator, a humectant, and an agent that decomposes organophosphorus nerve gas to generate hydrogen fluoride on a carrier.   2. The organophosphorus nerve gas detection material according to claim 1, wherein the agent that decomposes the organophosphorus nerve gas to generate hydrogen fluoride is a homogeneous catalyst for hydrogenation.   The organophosphorus nerve gas detecting material according to claim 2, wherein the homogeneous catalyst for hydrogenation is a copper complex salt.   4. The organophosphorus nerve gas detecting material according to claim 2, wherein the homogeneous catalyst for hydrogenation is copper sulfate.   The material for detecting an organophosphorus nerve gas according to claim 1, wherein the agent that decomposes the organophosphorus nerve gas to generate hydrogen fluoride is methyl cellosolve.

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