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Method for measuring residues of ethephon, thidiazuron and diuron in cotton by using liquid chromatography tandem mass spectrometry

A technique of tandem mass spectrometry and liquid chromatography, which is applied in the field of determination of ethephon, thidiazuron and diuron residues in cotton by liquid chromatography tandem mass spectrometry, which can solve the problems of poor reproducibility, clogging, and failure to measure thidiazuron at the same time. and diuron and other problems, to achieve the effect of a simple method

Inactive Publication Date: 2014-02-12
THE INSPECTION & QUARANTINE TECH CENT ZHEJIANG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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Problems solved by technology

With the development of liquid chromatography tandem mass spectrometry technology becoming more and more mature, this method is more and more applied to the determination and confirmation of pesticide residues in textiles and food. The above method uses liquid chromatography tandem mass spectrometry to determine ethephon in fruits, but Thididiuron and Diuron were not determined at the same time. At the same time, 20mM acetate buffer solution was used in the mobile phase, and the solution was prone to produce flocculent precipitates to block the mobile phase filter head, and the method had poor reproducibility
So far, there is no report on the simultaneous detection of ethephon, thiadiuron and diuron in cotton and vegetable samples by liquid chromatography-mass spectrometry / mass spectrometry

Method used

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  • Method for measuring residues of ethephon, thidiazuron and diuron in cotton by using liquid chromatography tandem mass spectrometry
  • Method for measuring residues of ethephon, thidiazuron and diuron in cotton by using liquid chromatography tandem mass spectrometry
  • Method for measuring residues of ethephon, thidiazuron and diuron in cotton by using liquid chromatography tandem mass spectrometry

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Embodiment Construction

[0032] 1. Sample processing

[0033] Weigh 1g of uniform sample (accurate to 0.01g), put it into a 50mL centrifuge tube with stopper, add 20mL of methanol-water (6:4, V / V) with pH=8, shake and extract for 20min, and centrifuge at 6000r / min After 5 minutes, the supernatant was taken and passed through a 0.22 mm organic filter membrane for determination by liquid chromatography tandem mass spectrometry.

[0034] 2. Determination

[0035] The standard working solution and sample solution were injected under the liquid chromatography tandem mass spectrometry conditions set in Table 1 and Table 2, with the mass concentration X (μg / kg) as the abscissa and the peak area Y as the ordinate, draw 5 points of standard work Use the standard working curve to quantify the sample, and the response value of the drug in the sample solution should be within the linear range of the instrument. Under the above-mentioned chromatographic conditions, to determine whether there is a corresponding a...

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Abstract

The invention relates to a method for measuring residues of ethephon, thidiazuron and diuron in cotton by using liquid chromatography tandem mass spectrometry. The method comprises the following steps: (1) processing a sample; (2) measuring; (3) judging, i.e., drawing a five-point standard working curve by taking mass concentration X as an abscissa and peak area Y as an ordinate, and quantifying the sample by using the standard working curve, wherein the response value of a medicament in the sample solution is required to be within the linear range detected by the instrument. The method is simple, convenient, quick and accurate, each item of technical index meets the requirements of domestic and international rules, and the method can be used for quantitative detection of the ethephon, the thidiazuron and the diuron in the cotton sample.

Description

technical field [0001] The invention relates to a method for determining pesticide residues in cotton, in particular to a method for determining residual amounts of ethephon, thiadizuron and diuron in cotton by liquid chromatography tandem mass spectrometry. Background technique [0002] With the continuous improvement of living standards, people's consumption concepts are also constantly improving. In terms of clothing, it must not only be warm, but also beautiful, and at the same time be safe and healthy. Different pesticides must be used in different stages of cotton production to prevent pests and weeds growth, which will affect the yield and quality of cotton fiber if not controlled. Although most of the pesticides in textiles are removed during the processing and production process, some pesticides still remain in the textiles. These pesticides are absorbed by the human body during the contact with human skin, which will cause toxic and side effects to the human body....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N30/02
Inventor 谢文侯建波史颖珠王伶黄超群董锁拽何建敏钱艳张文华
Owner THE INSPECTION & QUARANTINE TECH CENT ZHEJIANG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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