Quantitative detection method for chlorantraniliprole residue in tea leaf

A technology for the quantitative detection of chlorantraniliprole, which is applied in the field of quantitative detection of chlorantraniliprole residues in tea, can solve the problems of low processing efficiency, low penetration rate, and difficulty in promotion and use, and achieve adsorption capacity The effect of large and large specific surface area

Active Publication Date: 2017-03-29
SUZHOU ACADEMY OF AGRI SCI
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Problems solved by technology

Although the method reported in this patent is simple to operate and can be qualitative and quantitative, the sample is extracted homogeneously. When the number of samples is large, the processing efficiency is low, and cross-contamination is prone to occur. Difficult to use

Method used

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  • Quantitative detection method for chlorantraniliprole residue in tea leaf
  • Quantitative detection method for chlorantraniliprole residue in tea leaf
  • Quantitative detection method for chlorantraniliprole residue in tea leaf

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Embodiment

[0044] Example: A quantitative detection method for chlorantraniliprole residues in tea

[0045] The blank tea samples were taken from the tea field of the Agricultural Science Research Institute in Taihu Lake, Jiangsu Province. No pesticides were applied during the planting process, and the fresh leaves picked were made into dry tea according to the traditional green tea processing technology.

[0046] The actual test tea samples were purchased from a supermarket, and the place of origin was Suzhou East Dongting Mountain Tea Garden. The tea samples were pulverized with a pulverizer, mixed, and stored in a refrigerator at 4 °C.

[0047] The quantitative detection method consists of two parts:

[0048] In the first part, the standard curve of the measured chlorantraniliprole with known gradient concentration is respectively established by gas chromatography-electron capture method; the establishment of the standard curve consists of the following steps:

[0049] The first ste...

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Abstract

The invention relates to a quantitative detection method for chlorantraniliprole residue in tea leaf. The quantitative detection method is characterized in that the residual chlorantraniliprole in tea leaf is subjected to ultrasonic extraction with an acetonitrile solvent, impurities are removed with a proper amount of MWCNTS and a PSA adsorbent, the supernatant is subjected to nitrogen blowing and concentration to achieve a close drying state, volume metering is performed with an acetone-n-hexane mixed solvent having a volume ration of 1:1, programmed heating separation is performed with a HP-5 chromatographic column, ECD determination is performed with an electron capture detector, and quantitation is performed through a matrix external standard method. According to the present invention, the test results confirm that the method has characteristics of simple, rapid and accurate operation, easy popularizing and grasping and low cost, provides the rapid and reliable method for the determination of the chlorantraniliprole residue in the tea leaf, and can meet the requirements of the large-batch sample analysis on the quality and the progress.

Description

technical field [0001] The invention relates to the field of detection methods for pesticide residues, in particular to a quantitative detection method for chlorantraniliprole residues in tea leaves. The quantitative detection method is an improvement using multi-walled carbon nanotubes (MWCNTS) and PSA as adsorbents The QuEChERS method was used to remove impurities and purify the samples, and then gas chromatography-electron capture detector (GC-ECD) was used to determine chlorantraniliprole in tea, so as to achieve the purpose of fast, simple and reliable. Background technique [0002] During the growth process of tea trees, they are often invaded and harmed by various pests, which may cause tea yield reduction and lower quality, and seriously affect the growth or even death of tea trees. Therefore, it is very important to do a good job in tea tree pest control to ensure tea yield and quality. Pesticides are a necessary guarantee for tea production. According to statistics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/08G01N30/14
CPCG01N30/02G01N30/08G01N30/14G01N2030/143
Inventor 刘腾飞董明辉杨代凤张丽范君谢修庆顾俊荣孙灵湘毛健钱辉
Owner SUZHOU ACADEMY OF AGRI SCI
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