Simplified Approach for the Extraction of Quinclorac From Soils

摘要

A simplified version of the QuEChERS method for the extraction of quinclorac from soil samples was proposed. Optimum results were obtained dispersing soil in water, followed by the addition of 1 % acetic acid in acetonitrile, magnesium sulfate and sodium acetate as a modification of the quick, easy, cheap, effective, rugged and safe (QuEChERS) method. Liquid chromatography/ultraviotet (LC-UV) detector was then used to analyze the extracts without any other sample pretreatment. The result showed the recovery ranged from 73.8 to 106.4 % and 66,6 to 87.3 % with the relative standard deviations of 1,9 to 15.7 % and 4,7 to 9.3 % in two soil samples, respectively. The limit of detection (LOP) of the method was 0.05 mg kg~(-1). The limit of quantification (LOQ) was 0.5 mg kg~(-1). The half life period of quinclorac was 65.7 and 36.5 days in soil of Changsha and Nanning in China, respectively.