Gas chromatographic method for detecting residues of seven pyrethroid pesticides in surface water of farmland

Abstract

The invention discloses a gas chromatographic method for detecting residues of bifenthrin, fenpropathrin, cyhalothrin, cyfluthrin, cypermethrin, fenvalerate and deltamethrin in the surface water of a farmland. The gas chromatographic method is characterized in that with a petroleum ether-normal hexane (V:V=3:1) mixed solvent as an extracting agent, an extracting solution is used for carrying out trace analysis on a gas chromatograph after being concentrated by utilizing an rotary evaporator and purified by utilizing a Florisil column. The gas chromatographic method has the advantages that (1) the linear relations between the contents and peak areas of seven pyrethroid pesticides are good (within a range of 0.05-5.0mg / kg), the separation effect of an HP-5 chromatographic column to a target object is good, a detection result is high in accuracy and good in reproducibility, and the sensitivity of the method reaches technical requirements of the multi-residue detection of the pesticides; (2) the pretreatment of a sample is simple, convenient and rapid, the detection time is shortened, and the working efficiency is improved.

Description

technical field [0001] The invention establishes a gas chromatographic method for detecting the pesticide residues of bifenthrin, fenvalerate, cyhalothrin, cyfluthrin, cypermethrin, fenvalerate and deltamethrin in farmland surface water, which belongs to the detection technology of pesticide residues field. Background technique [0002] Pyrethroid pesticides are a class of insecticides that emerged in the 1970s and 1980s. They have the characteristics of high efficiency, broad spectrum, low toxicity, and low residue. It is mainly used to control pests on cotton, fruit trees, vegetables, tea trees, tobacco, soybeans and other crops, and is currently being widely used in agricultural production. However, a problem that cannot be ignored in the process is the impact of pesticides on the ecological environment. [0003] Previous studies have shown that only 10%-20% of the pesticides sprayed in the field adhere to the crops, and the remaining 80%-90% enter the soil or escape in...

AI Technical Summary

Problems solved by technology

However, a problem that cannot be ignored in the process is the impact of pesticides on the ecological environment.

[0003] Previous studies have shown that only 10%-20% of the pesticides sprayed in the field adhere to the crops, and the remaining 80%-90% enter the soil or escape into the air through evaporation, and the part of the pesticide that enters the soil is infiltrated and runoff. and rainwater scouring into the water body, resulting in serious pollution of farmland surface water and shallow groundwater

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