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Liquid chromatography determination method for nine organic pesticides in water

A liquid chromatography and organic pesticide technology, which is applied in the field of liquid chromatography determination of 9 organic pesticides in water, can solve problems such as inability to analyze and detect at the same time, and achieve the effects of shortened detection time, accurate method, and no mutual interference

Pending Publication Date: 2022-07-29
四川省遂宁生态环境监测中心站
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Problems solved by technology

[0003] Due to mutual interference among nine pesticides including atrazine, carbaryl, chlorothalonil, dichlorvos, dimethoate, demeton, parathion, methyl parathion and malathion, it is impossible to carry out simultaneous Analysis and detection of 9 pesticide organic pollutants such as terazine, carbaryl, chlorothalonil, dichlorvos, dimethoate, demeton, parathion, methyl parathion and malathion

Method used

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  • Liquid chromatography determination method for nine organic pesticides in water
  • Liquid chromatography determination method for nine organic pesticides in water
  • Liquid chromatography determination method for nine organic pesticides in water

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Embodiment

[0027] A liquid chromatographic assay method for 9 kinds of organic pesticides in water, comprising the following steps:

[0028] S1. Sample preparation:

[0029] Measure 100ml of the water sample to be tested through a graduated cylinder and place it in a 250ml separatory funnel, extract the water sample three times with 20ml of dichloromethane, and place the separatory funnel on a shaker for 5 times during each extraction. After the separatory funnel is allowed to stand for stratification and separation, the organic layers extracted three times are combined, the combined organic layers are dehydrated through a funnel equipped with anhydrous sodium sulfate, and the dehydrated organic layers are connected to the concentration bottle. , the dehydrated organic layer was concentrated with a concentrator, and the organic layer after concentrating to 0.5ml was adjusted to 1ml with a mixed liquid of methanol:water=6:4; the composition of the mixed liquid was V 甲醇 : V 水 =6:4; the 9...

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Abstract

The invention discloses a liquid chromatography determination method for nine organic pesticides in water. The liquid chromatography determination method comprises the following steps: pretreating a water sample; the method comprises the following steps: analyzing a pretreated water sample through a reversed-phase C18 column, quantifying by adopting an external standard method, determining the nature of each substance according to the retention time of each component, preparing calibration points with different concentrations according to the ratio of V methanol to V water of 6: 4 after nature determination, and sequentially determining from low to high, drawing a calibration curve by using the peak area and the concentration, and calibrating the calibration curve by using a standard solution concentration point; if the relative deviation exceeds 10%, drawing a standard curve again; testing a to-be-tested sample under the same analysis conditions as the calibration curve, and obtaining the concentration of a to-be-tested substance according to the calibration curve; according to the method disclosed by the invention, nine organic pesticides in water can be analyzed within a short time.

Description

technical field [0001] The present invention is in the field of water pollution, in particular to a liquid chromatography determination method of 9 kinds of organic pesticides in water. Background technique [0002] Atrazine, carbaryl, chlorothalonil, dichlorvos, dimethoate, systemic phosphorus, parathion, methyl parathion and malathion in the water body are all listed in the "Surface Water". The monitoring items stipulated in the Environmental Quality Standard GB3838-2002, there is currently no method and standard for simultaneous analysis by liquid chromatography in these items, and some chromatographic peaks in the existing methods interfere with each other (gas chromatography GB13192-1991), Some need to use a large amount of water samples (gas chromatography mass spectrometry HJ1189-2021 needs to use 1L water samples); and the retention time is longer for analysis and detection by gas chromatography or gas chromatography mass spectrometry. The determination of atrazine ...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/027G01N2030/062
Inventor 张海柱刘龙蒋红斌王璞杨政
Owner 四川省遂宁生态环境监测中心站
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