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Method for determining residual amount of chloropicrin in grains

A determination method, the technology of chloropicrin, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., to achieve the effects of accurate determination results, easy operation and good reproducibility

Pending Publication Date: 2021-03-16
中检科(北京)测试技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there is currently no method for the accurate and simple determination of chloropicrin residues in grains

Method used

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  • Method for determining residual amount of chloropicrin in grains
  • Method for determining residual amount of chloropicrin in grains
  • Method for determining residual amount of chloropicrin in grains

Examples

Experimental program
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Embodiment 1

[0086] In one embodiment, such as Figure 1 to Figure 4 As indicated, soybeans were selected as samples to measure the residual amount of chloropicrin in soybeans.

[0087] In an embodiment of the present invention, the assay method mainly includes the following steps:

[0088] S1: Use n-hexane and chloropicrin standard products to prepare chloropicrin standard working solutions with different concentrations;

[0089] S2: Process the grain sample to be tested and prepare it into a liquid to be tested;

[0090] S3: Using a gas chromatograph to measure the chloropicrinic standard working solution prepared in step S1, taking the chloropicrinic peak area of ​​the standard working solution as the ordinate, and the content of chloropicrin in the standard solution as the abscissa, draw a standard curve;

[0091] S4: Use a gas chromatograph to measure the liquid to be tested in step S2, and obtain the content of chloropicrin in the sample according to the standard curve in step S3. ...

Embodiment 2

[0139] In one embodiment, an example of a sample of purple sweet potato powder is also provided to further specify the method for determining the residual amount of chloropicrin in grains of the present invention.

[0140] In this example, the grain sample used is purple sweet potato flour 17#.

[0141] In this example, the pipette specifications and numbers used include: 5000 μL: R43263F; 1000 μF: G31523G; 200 μL: 2735227; 100 μL: R29762F.

[0142] In this embodiment, Agilent7890 gas chromatograph is used.

[0143] In an embodiment of the present invention, the assay method mainly includes the following steps:

[0144] S1': Use n-hexane and chloropicrin standard products to configure different concentrations of chloropicrin standard working solutions;

[0145] S2': Process the grain sample to be tested and prepare it into a liquid to be tested;

[0146] S3': Use gas chromatography to measure the standard working solution of chloropicrin prepared in step S1', take the peak ...

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Abstract

The invention provides a method for determining the residual amount of chloropicrin in grains. The method comprises the following steps: S1, preparing chloropicrin standard working solutions with different concentrations by using normal hexane and a chloropicrin standard substance; S2, treating a to-be-detected grain sample and preparing a to-be-detected liquid; S3, measuring the chloropicrin standard working solution prepared in the step S1 by adopting a gas chromatograph, and drawing a standard curve by taking the chloropicrin peak area of the standard working solution as an ordinate and thecontent of chloropicrin in the standard solution as an abscissa; and S4, measuring the to-be-measured liquid in the step S2 by adopting a gas chromatograph, and obtaining the content of the chloropicrin in the sample according to the standard curve in the step S3. According to the determination method, headspace gas chromatography is adopted to accurately determine the residual amount of chloropicrin in the cereal grains, the operation is simpler and more convenient, and the reproducibility is better.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis and detection, and more specifically relates to a method for determining residual chloropicrin in grains. Background technique [0002] Chloropicrin is an important fumigant, which is poisonous to insects and fungal germs. It can also be used for fumigation and disinfection of grain warehouses and grain storage rooms. It can also be used for wood preservation, ship disinfection, and for soil and plant seeds. Disinfection etc. Chloropicrin is a colorless or yellowish oily liquid with lachrymatory properties, volatile, strong diffusivity, and volatility increases with temperature. The chloropicrin vapor produced is 5 times heavier than air, and the medicinal effect is remarkable when the temperature is high, so fumigation at 20°C is generally more suitable. However, if the residual amount of chloropicrin in the food exceeds the standard, it will not only cause pollution to the food, but ...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/16
CPCG01N30/02G01N30/06G01N30/16G01N2030/047
Inventor 张洋施鹏斐李淑娟李翔刘汉霞汪春明杨波
Owner 中检科(北京)测试技术有限公司
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