A kind of detection method of organic pesticide in soil

Abstract

The invention provides a method for detecting organic pesticides in soil, the steps of which are as follows: S01 Accurately weigh a soil sample in a flask with an electronic balance, add a mixed solvent of distilled water and ether, shake it in a water bath, filter it with absorbent cotton, and collect the filtrate In a 100ml graduated cylinder filled with sodium chloride, vibrate vigorously for 1min, and let it stand at room temperature for 30min to separate the organic phase and the aqueous phase; S02 to obtain the organic phase, place chitosan in the organic phase, and continuously ultrasonically stir 20-40 minutes, stand still, filter, obtain the chitosan after the adsorption; S03 disperse the chitosan after the adsorption in the S02 in methanol pure solution, after ultrasonic stirring 10-40 minutes, filter, obtain the methanol liquid and shell Polysaccharide; S04 Disperse the chitosan in S03 in methanol mixed solution, after ultrasonic stirring for 10-50 minutes, add hydrochloric acid to adjust the pH value, continue ultrasonic stirring for 30 minutes, filter, and take the filtered liquid. S05 adds deionized water to the filtered liquid of S04, filters to obtain a solid, and detects the solid.

Description

technical field [0001] The invention relates to the detection field, and more particularly to a method for detecting organic pesticides in soil. Background technique [0002] Organophosphorus pesticides and pyrethroid pesticides are two types of pesticides widely used in various regions of my country at present. They have the characteristics of broad spectrum, high efficiency, economy, many varieties, and low dosage. They play an important role in preventing and controlling pests and weeds and ensuring crop yields. . However, studies have confirmed that these two types of pesticides can have toxic effects on the nervous system of the human body. Some varieties have carcinogenic, teratogenic, mutagenic effects and certain accumulation properties. Excessive use may accumulate in the human body, resulting in chronic accumulation poisoning. During the prevention and control of crop diseases and insect pests, most of them enter the soil through various channels. Organophosphorus ...

AI Technical Summary

Problems solved by technology

However, studies have confirmed that these two types of pesticides can have toxic effects on the nervous system of the human body. Some varieties have carcinogenic, teratogenic, mutagenic effects and certain accumulation properties. Excessive use may accumulate in the human body, resulting in chronic accumulation poisoning

During the prevention and control of crop diseases and insect pests, most of them enter the soil through various channels. Organophosphorus and pyrethroid pesticides have strong fat solubility and will be adsorbed in the soil for a long time, causing soil pesticide pollution, causing harm to soil organisms, and affecting soil fertility, and will pollute the water body through runoff, leaching, dissolution and other ways to affect aquatic organisms, and through the bioaccumulation and amplification effects of the food chain, it will eventually endanger human health