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Gas chromatography method for detecting residual quantity of eight organophosphorus pesticides contained in soil

An organophosphorus pesticide and gas chromatography technology, which is applied in the field of pesticide residue detection, can solve problems such as soil ecological environment and soil residue, and achieve the effects of shortening detection time, saving costs, and simplifying pretreatment steps.

Inactive Publication Date: 2013-12-11
邬金飞
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a class of high-efficiency and broad-spectrum insecticides, organophosphorus pesticides are being widely used in the field of crop pest control, but a problem that cannot be ignored in the process is the problem of soil ecological environment. Applied in various ways, all will remain in the soil

Method used

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  • Gas chromatography method for detecting residual quantity of eight organophosphorus pesticides contained in soil
  • Gas chromatography method for detecting residual quantity of eight organophosphorus pesticides contained in soil
  • Gas chromatography method for detecting residual quantity of eight organophosphorus pesticides contained in soil

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Embodiment Construction

[0029] Method 1: Detection of 8 organophosphorus pesticide residues in clay

[0030] (1) Pretreatment of clay soil samples

[0031] ①Use an electronic balance for extraction to accurately weigh 15.0g of soil sample into a 250ml Erlenmeyer flask with a stopper, add 15ml of distilled water and 50ml of dichloromethane-acetone (V:V=1:1) mixed solvent, and place in a water bath (25±1) After shaking at 200r / min for 30min on an oscillator at ℃, filter with absorbent cotton, collect the filtrate in a 100ml stoppered graduated cylinder filled with 7g-10g sodium chloride, shake vigorously for 1min, and let stand at room temperature for 30min to make the organic phase and water phase stratification;

[0032] ②Purification Draw 10.0 ml of organic phase solution from a 100 ml stoppered measuring cylinder into a 15 ml graduated test tube, put the test tube into a water bath to heat, control the temperature of the water bath at 40°C, and slowly pass nitrogen or air into the test tube , whe...

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Abstract

The invention discloses a gas chromatography method for detecting the residual quantity of eight organophosphorus pesticides contained in soil (loamy soil, clay and sandy soil) with different textures, and the gas chromatography method realizes the qualitative and quantitive detection of the pesticide residues of acephate, omethoate, dimethoate, phorate, malathion, fenitrothion, isocarbophos and hostathion. The gas chromatography method is characterized in that a dichloromethane-acetone (V:V=1:1) mixed solvent is used as an extracting agent; and an extracting solution is concentrated, metered in volume and filtered and then directly subjected to trace analysis on a gas chromatograph. The gas chromatography method disclosed by the invention has the advantages of good separation effect of chromatographic columns on target objects, high detection result accuracy and good repeatability and meets the detection requirements of residual pesticides on sensitivity; compared with the GB / T14552-2003 (gas chromatography method for detecting the organophosphorus pesticides contained in water and soil) national standard method, the gas chromatography method disclosed by the invention is simpler and more convenient, simplifies the preprocessing steps of a soil sample, shortens the detection time and saves the cost.

Description

technical field [0001] The present invention establishes a method for detecting acephate, omethoate, dimethoate, phorate, malathion, fenitrothion, isocarbophos, and trimethoate in soils with different textures (clay, loam, and sandy soil). The invention discloses a gas chromatography method for the residues of eight kinds of organophosphorus pesticides, belonging to the technical field of pesticide residue detection. Background technique [0002] my country is a developing country with a large agricultural and populous population, as well as a large country in the production and use of pesticides. In recent years, the total amount of pesticides used in my country has reached more than 1.4 million tons (patented drugs), and the amount used per unit of sowing area is nearly 15kg / hm 2 , which is twice the average level of developed countries and the world. In the whole country, about 380 million hectares of pesticides are used to control diseases, insect pests and weeds every...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 邬金飞
Owner 邬金飞
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