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Sample preparation device for fire scene oxidant infrared spectrum testing

A technology of infrared spectroscopy and combustion enhancer, which is applied in the field of adsorption and enrichment devices for target detection substances, can solve the problems of unfavorable characteristic absorption peak detection, hazards, and long time, and achieve large sample processing capacity, shorten extraction time, and simple structure Effect

Active Publication Date: 2013-07-17
SHANGHAI FIRE RES INST OF MEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the potassium bromide tablet method is adopted, the concentrated extract is dropped on the potassium bromide tablet for infrared analysis, because organic solvents such as carbon disulfide have low boiling points, they will volatilize during the infrared scanning process and have poor stability; The oil film of the combustion aid formed after the solvent evaporates completely is thin, which is not conducive to the detection of characteristic absorption peaks; repeated dripping can form a relatively thick film, but this method is cumbersome to operate on the one hand, and causes greater loss of analytes on the other hand. It is extremely unfavorable for a small amount of tested substances, and the toxic organic solvent volatile gas produced is also a hazard to experimenters
Since potassium bromide has an adsorption effect on gasoline and other combustion accelerants, mixing potassium bromide powder with the extracted organic solvent and then concentrating and removing the organic solvent has good stability and can achieve a good enrichment effect. However, blank bromine The difference in weight between potassium chloride tablets and potassium bromide samples will cause errors, and the method takes a long time

Method used

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  • Sample preparation device for fire scene oxidant infrared spectrum testing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: as figure 1 As shown, the device consists of a slide container 1, a connector 2, a buffer tube 3, a flow guide tube 4, a pressure balance tube 5, a sample pool 6, a three-port device 7, a gas receiver 8, a vent valve 9 and an air guide hose 10, characterized in that slide container 1 is connected with vent valve 9, and slide container 1 is airtightly connected to the opening of the lower end of buffer tube 3 located at the bottom of sample pool 6 through connector 2; the upper part of sample pool 6 and buffer tube 3 pass through The air pressure balance tube 5 is connected; the inside of the buffer tube 3 is provided with a guide tube 4, and the guide tube 4 is connected with the sample pool 6, and a piston is arranged at the connection; The lower end is connected to the gas receiver 8; the three-port device 7 is connected to the vacuum pump through the air guiding hose 10.

[0020] Working process of the present invention is as follows:

[0021] 1. Plac...

Embodiment 2

[0028] When in use, step 1: Weigh about 200 mg of KBr powder and press it into tablets, and perform a background test on Fourier transform infrared spectroscopy; keep the background, take out the KBr sheet, and place it at the bottom of the slide container, and assemble the device in the above-mentioned manner.

[0029] Step 2: Use CS to burn the burning debris in the fire scene 2 Solvent extraction, after removal of water by desiccant, CS 2 Pour the extract into the sample pool, cover the sealing plug, adjust the piston on the guide tube, CS 2 The extract was slowly dripped onto the KBr sheet, and kept the liquid level slightly higher than the KBr sheet. With the volatilization of the solvent of the light component extract under negative pressure, the combustion promoter components in it are completely absorbed and enriched by the KBr sheet. During this process, a heating device such as a hair dryer can be appropriately used to heat the slide container to accelerate solvent...

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Abstract

The invention relates to a sample preparation device for fire scene oxidant infrared spectrum testing. The sample preparation device comprises a loading container, a connecting piece, a sample pool, an empting valve, a three-opening device and a gas leading hose. The loading container is connected with the emptying valve, and is hermetically connected with a lower end opening of a buffering pipe at a lower part of the sample pool through the connecting piece; an upper part of the sample pool is connected with the buffering pipe through an atmosphere balancing pipe; a gas duct is arranged in the buffering pipe, the gas duct is connected with a liquid pool, and a piston is arranged at the connecting part; an upper part opening of the buffering pipe is connected with the three-opening devicethrough the gas leading hose; a lower end of the three-opening device is connected with a gas receiver, and the gas receiver is connected with a vacuum pump through the gas leading hose. The sample preparation device has the advantages of simple structure, low cost, good stability, high enriching efficiency, small solvent background influence and rapidness and convenience in operation.

Description

technical field [0001] The invention relates to an adsorption and enrichment device for a target detection substance, in particular to an adsorption and enrichment device for combustible and combustible liquid components in burning debris at a fire scene. Background technique [0002] The occurrence of arson cases has caused serious harm to social stability and the safety of people's lives and property. Criminals often use some combustion accelerants, such as gasoline, diesel and other flammable and combustible liquids, to set fire. When fire investigators enter the fire scene for investigation and find traces of suspected arson such as low-level combustion and multiple fire points, the suspicious parts and the burning wreckage around them will be extracted for laboratory testing and analysis to further identify whether there is a combustion accelerant The existence of the fire and what kind of accelerant was used, so as to promote the investigation and help the cracking of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N21/25
Inventor 顾海昕张永丰黄昊包任烈薛林闵永林廖彦秋
Owner SHANGHAI FIRE RES INST OF MEM