Method suitable for detecting residues of eleven defoliating agents in cotton

A detection method and defoliant technology, which are applied in measuring devices, instruments, scientific instruments, etc., to meet the requirements of pesticide residue limits, easy to operate, and reduce the harm of laboratory personnel and the environment.

Inactive Publication Date: 2014-10-08
THE INSPECTION & QUARANTINE TECH CENT ZHEJIANG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

These methods generally can only detect one defoliant in cotton, and there are only 8 kinds at most, and the detection sensitivities are not the same

Method used

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  • Method suitable for detecting residues of eleven defoliating agents in cotton
  • Method suitable for detecting residues of eleven defoliating agents in cotton
  • Method suitable for detecting residues of eleven defoliating agents in cotton

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Embodiment 1

[0078] Embodiment 1. An accelerated solvent extraction-ultrahigh pressure liquid chromatography-tandem mass spectrometry detection method suitable for the determination of various defoliant residues in cotton, comprising the following steps:

[0079] 1), prepare the sample solution to be tested

[0080] (1), take the lint sample and mix evenly, weigh 1.0g sample (as the cotton to be tested), accurate to 0.01g, put it into the accelerated solvent extraction cell, and then place it at the bayonet of the sample tube of the accelerated solvent extraction instrument;

[0081] (2) Operate according to the set extraction program: temperature 100°C, pressure 1500psi, preheating for 2 minutes, heating for 5 minutes, static extraction with methanol for 5 minutes, 60% of the volume of the extraction cell to quickly rinse the sample with methanol, and purging with nitrogen for 60 seconds to collect all the extracts , static extraction runs for 2 cycles (referring to the extraction cycle o...

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Abstract

The invention discloses a method suitable for detecting residues of eleven defoliating agents in cotton. The method is characterized by comprising the following steps: (1) preparing a sample solution to be detected, namely weighing cotton to be detected, and extracting by utilizing an accelerated solvent extraction device; by taking methanol as an extraction agent, operating according to a set extraction program; performing vacuum concentration after extraction is finished, fixing the volume and centrifuging; obtaining the supernatant; (2) preparing a standard solution, namely preparing a 0.01-0.30mu g/mL of gradient standard working solution of eleven defoliating agent pesticides; (3) injecting the gradient standard solution into an ultrahigh pressure liquid chromatography-tandem mass spectrometer, measuring in a positive and negative ion multiple-reaction monitoring mode, and making a standard curve equation; (4) measuring the supernatant obtained in the step (1) according to a method in the step (3) to finally obtain the content of each defoliating agent pesticide in the sample to be detected.

Description

technical field [0001] The invention relates to a method for detecting residues of 11 kinds of defoliants in cotton. Background technique [0002] Cotton is currently the single fiber variety with the largest consumption in the world. The total amount reaches more than 40% of the fiber consumption, and it accounts for 3 / 4 of the natural fibers. It is the most important fiber product in the textile industry. In recent years, with the improvement of environmental protection and natural clothing requirements, the proportion of cotton in textile products, especially in clothing and home textile products, has increased. However, cotton is one of the agricultural by-products with the largest consumption of pesticides, about 60% of the world's agrochemicals are used in cotton production, more than any other crops. Before the cotton is harvested, a large amount of defoliants are used to promote the leaves of the cotton plants to fall off as soon as possible, so as to improve the op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88G01N30/06
Inventor 吴刚董锁拽赵珊红王力君张明誉
Owner THE INSPECTION & QUARANTINE TECH CENT ZHEJIANG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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