A method for measuring pesticide adjuvant residues based on gas chromatography

A pesticide adjuvant and gas chromatography technology, applied in the field of detection of pesticide adjuvant residues, can solve problems such as unguaranteed food safety, inaccurate data, and poor detection results, and achieve high detection efficiency, high precision, and wide application range wide effect

Active Publication Date: 2022-02-18
CHONGQING ACAD OF METROLOGY & QUALITY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A method for measuring pesticide adjuvant residues based on gas chromatography
  • A method for measuring pesticide adjuvant residues based on gas chromatography
  • A method for measuring pesticide adjuvant residues based on gas chromatography

Examples

Experimental program
Comparison scheme
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 amount of pesticide adjuvant based on gas chromatography, and specifically relates to the field of detection of the residual amount of pesticide adjuvant. The specific detection steps are as follows: S1, sample preparation; S2, sample extraction; S3, sample purification ; S4, pre-measurement preparation; S5, measurement; S6, parallel test; S7, blank test; S8, analysis result calculation. In the present invention, the sample is extracted with acetonitrile homogenate, after salting out and centrifugation, the supernatant is taken, purified by PSA, detected by a gas chromatography-mass spectrometer, and a feature-selected ion monitoring scan mode (SIM) is adopted to measure the retention time and qualitative The abundance ratio of ion fragments is qualitative, and the external standard method is quantitative, so that the measurement of pesticide adjuvant residues is more accurate. Compared with traditional gas chromatography, the detection accuracy 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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Patent Type & Authority Patents(China)
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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