Method for simultaneously measuring residue contents of five weedicides with different structures in soil

Abstract

The invention discloses a method for simultaneously measuring the residue contents of five weedicides with different structures in soil, and belongs to the technical field of physicochemical detection of pesticide residues in the soil. Specifically, the residue contents of three types of five weedicides with different structures in the soil are directly measured by a high-performance liquid chromatographic (HPLC) instrument by combining dispersive solid-phase extraction (DSPE) with dispersive liquid-liquid microextraction (DLLME). According to the method, the defects and the condition limitations in the prior art are overcome, a method for pre-treating a soil sample and the detection conditions of the instrument are optimized, a DSPE-DLLME-HPLC method is built for simultaneously detecting three types of five weedicides (metsulfuron methyl, bensulfuron methyl, prometryn, atrazine and quinclorac) with different structures in the soil, the linear correlation coefficients are all more than 0.99, the detection limit is 1.5-3.1 ngg<-1>, the average recovery rate is 74.9-90.1%, the relative standard deviation (RSD) is 4.0-5.7%, both the accuracy and the precision meet the residue detection requirements, and the method has the characteristics of low organic solvent consumption, good purification and concentration effects, high sensitivity, simplicity for performing and the like.

Description

technical field [0001] The invention relates to the technical field of physical and chemical detection of pesticide residues in soil, in particular to a method for simultaneously measuring the residues of five herbicides with different structures in soil. Background technique [0002] Quinoline carboxylic acids, sulfonylureas and triazines, as commonly used herbicides, have been widely used in agricultural production, but they also cause pollution of soil, water, air and agricultural products. In addition, quinoline carboxylic acids, sulfonylureas and triazines have relatively stable chemical properties, are difficult to degrade in the environment, have a long residual effect period, and cause phytotoxicity to sensitive crops that will seriously affect their yield and quality. The detection of quinoline carboxylic acid, sulfonylurea and triazine herbicide residues in complex matrices such as soil and agricultural products is very important, not only can effectively avoid the...

AI Technical Summary

Problems solved by technology

The present invention adopts dispersed solid phase extraction (DSPE) in combination with dispersed liquid liquid microextraction (DLLME) as the pretreatment technology of soil sample, and utilizes high performance liquid chromatography (High performance liquid chromatography, HPLC) to measure, has overcome existing method It can quickly and accurately detect five kinds of metsulfuron-methyl, bensulfuron-methyl, promethazone, atrazine and quinclorac Residues of herbicides with different structures, accurate determination results, less interference

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