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Method for detecting organophosphorus multi-pesticide residue in tea based on matrix effect compensation

A technology of matrix effect and determination method, which is applied in the direction of measuring devices, preparation of test samples, instruments, etc., can solve problems such as failure to adopt, enough attention to the influence of matrix effect, etc., to eliminate interference, prolong instrument maintenance cycle, and high sensitivity Effect

Inactive Publication Date: 2010-07-21
TEA RES INST CHINESE ACAD OF AGRI SCI
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Problems solved by technology

[0005] At present, there are few domestic researches on this issue, and the development of many pesticide residue analysis methods in China has not paid enough attention to the impact of matrix effects, and has not taken corresponding compensation measures.

Method used

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  • Method for detecting organophosphorus multi-pesticide residue in tea based on matrix effect compensation
  • Method for detecting organophosphorus multi-pesticide residue in tea based on matrix effect compensation
  • Method for detecting organophosphorus multi-pesticide residue in tea based on matrix effect compensation

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Experimental program
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Effect test

Embodiment

[0055] 1. Preparation of pesticide standard solution

[0056] Single pesticide standard stock solution: Accurately weigh a certain amount of a certain pesticide standard product, dilute it with acetone, and prepare 51 kinds of pesticide 1000mg / L single pesticide standard stock solution one by one, and store it in a refrigerator below -18°C.

[0057] Pesticide mixed standard stock solution and pesticide mixed standard working solution: divide 51 kinds of pesticides into 2 groups, according to the groups in Table 1, divide 51 kinds of organophosphorus pesticides into 2 groups according to the separation efficiency, and absorb them one by one according to the instrument response of each pesticide A certain volume of individual pesticide stock solutions of the same group were poured into the same volumetric flask, diluted to the mark with acetone, and two groups of pesticide mixed standard stock solutions were prepared in the same way. For chromatographic determination, take 1.0mL...

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Abstract

The invention relates to a method for detecting an organophosphorus multi-pesticide residue in tea based on matrix effect compensation, which belongs to the technical field of safety detection of foods. The method comprises the following steps of: (1) mixing a pesticide standard solution; (2) preparing a sample solution; (3) detecting a sample to be detected by a gas chromatogram and mixing the standard solution. The method is rapid, simple and economic, has high sensitivity, effectively reduces or eliminates the interference of a complex matrix derived from the tea on the detection of organophosphorus pesticide residues and provides a scientific basis for further improving an evaluation system of the quality safety of the tea.

Description

technical field [0001] The invention belongs to the technical field of food safety detection, and in particular relates to a method for measuring organophosphorus polypesticide residues in tea based on matrix effect compensation. Background technique [0002] Pesticide residue chromatographic detection is the analysis of trace components in complex mixtures, and the influence of matrix effect issues is extremely significant. The matrix effect in the process of pesticide residue analysis, that is, the matrix components other than the analyte in the sample cause the measured value of the analyte to deviate from the true value, affecting the quantitative accuracy and precision of the analyte, and the influencing factors are changeable, it is difficult to be completely eliminated, seriously affecting the accuracy of the test results. In gas chromatography analysis, most pesticides show different degrees of matrix enhancement effect, especially the matrix effect of organophospho...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N1/28G01N1/38
Inventor 蒋迎刘新段俊彦汪庆华陈红平
Owner TEA RES INST CHINESE ACAD OF AGRI SCI
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