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Analytical method for simultaneous determination of organophosphorus and pyrethroid pesticide residues in fresh tea leaves

A technology for pyrethroids and pyrethroids is applied in the analysis field of simultaneous determination of organophosphorus and pyrethroid pesticide residues in fresh tea leaves, and can solve the problems of cumbersome operation, long time consumption, unstable and reliable detection results, etc. problem, to achieve the effect of strong flexibility and wide application range

Active Publication Date: 2015-08-26
江苏太湖地区农业科学研究所
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Problems solved by technology

[0006] The present invention provides an analytical method for simultaneously determining the residues of organophosphorus and pyrethroid pesticides in fresh tea leaves. The problems of cumbersome operation, high consumption of organic solvents and insufficient stability and reliability of test results

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  • Analytical method for simultaneous determination of organophosphorus and pyrethroid pesticide residues in fresh tea leaves
  • Analytical method for simultaneous determination of organophosphorus and pyrethroid pesticide residues in fresh tea leaves
  • Analytical method for simultaneous determination of organophosphorus and pyrethroid pesticide residues in fresh tea leaves

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Embodiment

[0045] Example: An Analytical Method for Simultaneous Determination of Organophosphorus and Pyrethroid Pesticide Residues in Fresh Tea Leaves

[0046] The fresh leaves of the tested tea were taken from a local tea plantation in Suzhou, crushed and mixed by a pulverizer, put into a clean container, and stored in a -20°C refrigerator for later use. The analytical method consists of two parts:

[0047] In the first part, the standard curves of the measured organophosphorus pesticides and pyrethroid pesticides of known gradient concentrations are respectively established by gas chromatography; the establishment of the standard curve consists of the following steps:

[0048] The first step is to prepare a blank matrix extract, and the preparation method consists of the following steps:

[0049] (1) Weigh 5.0 g of blank tea fresh leaf samples that do not contain tested organophosphorus pesticides and pyrethroid pesticides, place them in a 50 mL centrifuge tube, and then add 10 mL o...

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Abstract

The invention discloses an analytical method of simultaneously measuring the residues of organophosphorus pesticide and pyrethriods pesticide in fresh leaves. The analytical method is characterized in that performing supersonic extraction on a tea fresh leaf sample by using an acetonitrile solution with the volume fraction of acetic acid being 1%, purifying by a proper amount of a PSA,C18 and GSB mixing padding, performing nitrogen blowing concentration on supernatant liquid to be almost dried, making up to volume by acetone and normal hexane, performing heating separation by DB-1701 and HP-5 quartz capillary columns, detecting GC / FPD and GC / muECD, and finally performing quantitative measuring by adopting a basic external standard method. Tests show that a linearity range is wide through, technical indexes such as detection sensitivity, accuracy and precision all meet requirements of residue analysis, the pretreatment operation is simple, convenient and rapid, and reliable methods are provided for analytical investigation of simultaneously measuring the residues of the organophosphorus pesticide and pyrethriods pesticide.

Description

technical field [0001] The present invention relates to the field of analytical methods for pesticide residues, in particular to an analytical method for simultaneously measuring organic phosphorus and pyrethroid pesticide residues in fresh tea leaves. Extract, purify, and then use gas chromatography to detect organophosphorus and pyrethroid pesticides, so as to achieve the purpose of fast, simple and reliable. Background technique [0002] Tea is one of the three major plant beverages in the world. It is more and more popular because of its unique taste and health effects such as anti-cancer, anti-mutation, scavenging free radicals, and delaying aging. my country is a big tea producing and exporting country. The application of pesticides is the most effective means to ensure the yield of tea and to control its growth from the threat of pests and diseases. Organophosphorus pesticides (English name: Organophosphorus pesticides) and pyrethroid pesticides (English name: Name: P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/14
Inventor 刘腾飞董明辉杨代凤谢修庆蒋宝南邓金花张丽顾俊荣陆皓茜李军钱辉
Owner 江苏太湖地区农业科学研究所
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