Method for simultaneously measuring residue of multiple pesticides in cotton by liquid chromatography tandem mass spectrometry/mass spectrometry method

Abstract

The invention relates to a method for simultaneously measuring the residue of multiple pesticides in cotton by a liquid chromatography tandem mass spectrometry / mass spectrometry method. The method comprises the steps of (1) carrying out sample treatment; (2) measuring by adopting the liquid chromatography tandem mass spectrometry / mass spectrometry method; (3) carrying out a blank test; and (4) carrying out result calculation and expression, namely calculating the contents of all the pesticides in a sample according to a formula: X=CV / m, wherein X represents the contents of all the pesticides in the sample in milligrams per kilogram, C represents the concentrations of all the pesticides in sample liquid obtained by a standard work curve in micrograms per milliliter, V represents the final volume of the sample liquid in milliliters, and m represents the sample amount of the final sample liquid in grams. The measurement method can be used for simultaneously measuring the residue of the multiple pesticides in the cotton by adopting the liquid chromatography tandem mass spectrometry / mass spectrometry method and is simple, convenient, fast, accurate and reliable; the detection limit, the recovery rate and the accuracy of the method are in accordance with the requirements.

Description

technical field [0001] The invention relates to a method for determining multiple pesticide residues in cotton, in particular to a method for quantitatively detecting multiple pesticides in cotton by liquid chromatography tandem mass spectrometry / mass spectrometry. Background technique [0002] Cotton has good moisture absorption, air permeability and warmth retention, and has the reputation of "the king of fibers", so it is widely used in the textile industry. Since my country's entry into the WTO, the export of cotton textiles has also increased significantly, resulting in a growing gap between cotton production and demand. At present, my country has become the world's largest cotton importer. In the process of cotton planting, diseases and weeds need to be prevented and controlled, otherwise the yield of cotton will be seriously affected. Therefore, the use of a large amount of pesticides can greatly improve the production efficiency of cotton. [0003] At present, the...

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Problems solved by technology

[0003] At present, there are national standards GB / T18412.1-2006, GB / T18412.2-2006, GB / T18412.3-2006, GB / T18412.4-2006, GB / T18412.5-2006, GB / T18412.6- 2006 and GB / T18412.7-2006 are applied to the detection of pesticide residues in textiles, but there is no method for the simultaneous determination of multiple pesticide residues in cotton by liquid chromatography tandem mass spectrometry / mass spectrometry, and there is no method for the detection of amides in cotton. Pesticides are tested

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