摘要
Abstract
A simple, reliable and accurate method has been developed to determine ethirimol residue in cucumber and soil, and the degradation dynamics of ethirimol in cucumber and soil were studied. Parameters, affecting the performance of analysis such as absorption wavelength, mobile phase, amount of water added into soil and clean-up procedure, were studied and optimized. Under the optimum conditions of analysis (Cucumber and soil samples were extracted by acetonitrile and acetone, respectively; then, the extracted solution was cleaned up by silica gel cartridge and analyzed by HPLC equipped with DAD; finally, the residual content was quantified by ESTD), the performance of the method was evaluated. The results showed the limit of detection of the method was 3.5×10~(-10)g, and the limit of quantificaiton in cucumber and soil were 0.010 mg·L~(-1) and 0.005 mg·kg~(-1), respectively. Average fortified recovery of the method varied from 80.5% to 103.1% with the relative standard deviation varying from 2.10% to 3.74%. Furthermore, the degradation dynamics indicated ethirimol degraded along prolongation of time, the curve of degradation dynamics accorded with the first-order kinetics equation, and the half-lives of ethirimol in cucumber and soil were 3.5 day and 9.9 day, respectively. The degradation rate of ethirimol in cucumber was faster than that in soil, which probably resulted from the dilution effect of cucumber's growth. To sum up, ethirimol should be classified as easily degradable agrochemical and the gained parameters of degradation dynamics provided scientific basis for the safety evaluation on ethirimol.关键词
乙嘧酚/黄瓜/土壤/残留/消解动态Key words
ethirimol/ cucumber/ soil/ residue/ degradation dynamics分类
资源环境
