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Method for measuring residual quantity of pesticide adjuvant based on gas chromatography

A pesticide adjuvant and gas chromatography technology, which is applied in the field of pesticide adjuvant residue detection, can solve the problems of unguaranteed food safety, inaccurate data, poor detection effect, etc. wide effect

Active Publication Date: 2019-11-05
CHONGQING ACAD OF METROLOGY & QUALITY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing fruits and vegetables generally use gas chromatography for detection of pesticide residues, but the detection data is inaccurate and the detection effect is not good, resulting in food safety not being guaranteed, and a waste of manpower and material resources

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  • Method for measuring residual quantity of pesticide adjuvant based on gas chromatography
  • Method for measuring residual quantity of pesticide adjuvant based on gas chromatography
  • Method for measuring residual quantity of pesticide adjuvant based on gas chromatography

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A method for measuring pesticide adjuvant residues based on gas chromatography, the specific detection steps are as follows:

[0049]S1. Sample preparation: Sampling of fruits and vegetables (sampling sites are carried out in accordance with Appendix A of GB 2763-2016 (National Food Safety Standard for Maximum Residue Limits of Pesticides in Food)), pulverize and mix the samples, and homogenize them to make a homogenate , the prepared sample is divided into two parts, put into a clean sample container, sealed and marked, and then stored in a freezer at -18°C for later use;

[0050] S2, sample extraction: Weigh 10.0g homogenized sample into a 50mL plastic centrifuge tube, add 10mL acetonitrile solution and vortex for 2min, add QuEChERS extraction bag under ice bath condition (containing 6g anhydrous magnesium sulfate and 1.5g anhydrous Sodium acetate in water), then vortexed for 1min, and centrifuged at 5000r / min at a high speed for 5min in a centrifuge at 4°C;

[0051]...

Embodiment 2

[0073] A method for measuring pesticide adjuvant residues based on gas chromatography, the specific detection steps are as follows:

[0074] S1. Sample preparation: Sampling of fruits and vegetables (sampling sites are carried out in accordance with Appendix A of GB 2763-2016 (National Food Safety Standard for Maximum Residue Limits of Pesticides in Food)), pulverize and mix the samples, and homogenize them to make a homogenate , the prepared sample is divided into two parts, put into a clean sample container, sealed and marked, and then stored in a freezer at -18°C for later use;

[0075] S2, sample extraction: Weigh 10.0g homogenized sample into a 50mL plastic centrifuge tube, add 10mL acetonitrile solution and vortex for 2min, add QuEChERS extraction bag under ice bath condition (containing 6g anhydrous magnesium sulfate and 1.5g anhydrous Sodium acetate in water), then vortexed for 1min, and centrifuged at 5000r / min at a high speed for 5min in a centrifuge at 4°C;

[0076...

Embodiment 3

[0098] A method for measuring pesticide adjuvant residues based on gas chromatography, the specific detection steps are as follows:

[0099] S1. Sample preparation: Sampling of fruits and vegetables (sampling sites are carried out in accordance with Appendix A of GB 2763-2016 (National Food Safety Standard for Maximum Residue Limits of Pesticides in Food)), pulverize and mix the samples, and homogenize them to make a homogenate , the prepared sample is divided into two parts, put into a clean sample container, sealed and marked, and then stored in a freezer at -18°C for later use;

[0100]S2, sample extraction: Weigh 10.0g homogenized sample into a 50mL plastic centrifuge tube, add 10mL acetonitrile solution and vortex for 2min, add QuEChERS extraction bag under ice bath condition (containing 6g anhydrous magnesium sulfate and 1.5g anhydrous Sodium acetate in water), then vortexed for 1min, and centrifuged at 5000r / min at a high speed for 5min in a centrifuge at 4°C;

[0101]...

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Abstract

The invention discloses a method for measuring the residual quantity of a pesticide adjuvant based on gas chromatography, and particularly relates to the field of detection of the residual quantity ofthe pesticide adjuvant, wherein the detection steps are as follows: S1, preparing a sample; S2, carrying out sample extraction; S3, carrying out sample purification; S4, preparing in the early stage of measurement; S5, measuring; S6, carrying out parallel test; S7, carrying out blank test; and S8, analyzing result and calculating. According to the invention, a sample is homogenized and extracted by acetonitrile, and subjected to salting-out centrifugation, a supernatant is taken, the sample is purified by PSA, the sample is detected by a gas chromatography-mass spectrometer, a characteristic selection ion monitoring scanning mode (SIM) is adopted, the qualitative analysis is carried out according to the retention time and the abundance ratio of qualitative ion fragments, and the quantification is carried out by an external standard method, so that the measurement of the residual quantity of the pesticide adjuvant is more accurate, and compared with the traditional gas chromatography, the detection precision is higher and the detection is more efficient.

Description

technical field [0001] The invention relates to the technical field of detection of pesticide adjuvant residues, more specifically, the invention relates to a method for measuring the residues of pesticide adjuvants based on gas chromatography. Background technique [0002] Gas chromatography has effective separation and resolution capabilities for organic compounds, while mass spectrometry is an effective means to accurately identify compounds. The chromatography-mass spectrometry technology composed of the combination of the two can directly use gas chromatography to separate complex mixture (such as crude oil, rock extract) samples under the control of a computer, so that the compounds in it can enter the ion source of the mass spectrometer one by one. , electron bombardment, or chemical ionization can be used to ionize all compounds in each sample. [0003] Existing fruits and vegetables generally use gas chromatography for detection of pesticide residues, but the detec...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/26G01N30/86
CPCG01N30/02G01N30/06G01N30/26G01N30/8679G01N2030/025G01N2030/062
Inventor 李根容余文琴肖昭竞童兰艳龙梅
Owner CHONGQING ACAD OF METROLOGY & QUALITY INST
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