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Method for Determination of Ethephon, Thidiazuron and Diuron Residues in Cotton by Liquid Chromatography Tandem Mass Spectrometry

A technology of tandem mass spectrometry and liquid chromatography, which is applied in the field of determination of pesticide residues in cotton, can solve the problems of poor reproducibility, blockage, non-simultaneous determination of thiadizuron and diuron, etc., and achieve the effect of simple method

Inactive Publication Date: 2016-04-13
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 Determination of Ethephon, Thidiazuron and Diuron Residues in Cotton by Liquid Chromatography Tandem Mass Spectrometry
  • Method for Determination of Ethephon, Thidiazuron and Diuron Residues in Cotton by Liquid Chromatography Tandem Mass Spectrometry
  • Method for Determination of Ethephon, Thidiazuron and Diuron Residues in Cotton by 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 stoppered centrifuge tube, add 20mL of methanol-water (6:4, V / V) with pH=8, shake and extract for 20min, and centrifuge at 6000r / min for 5min , and the supernatant was 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 analyte in the s...

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Abstract

The invention relates to a liquid chromatography tandem mass spectrometry method for determining the residual amount of ethephon, thiadiuron and diuron in cotton, the method is as follows: 1) sample processing; 2) measurement; 3) judgment: take the mass concentration X as horizontal Coordinates, peak area Y is the ordinate, draws 5 points of standard working curve, samples are carried out quantitatively with standard working curve, the response value of medicine in the sample solution should be in the linear range of instrument detection; Method of the present invention is simple, quick and accurate , the technical indicators meet the requirements of domestic and foreign laws and regulations, and can be used for the quantitative detection of ethephon, thiadizuron and diuron in cotton samples.

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 Patents(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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