[Aims]This study aims to clarify the degradation regularity of isopyrazam in soil and provide theoretical support for its fate in the environment.[Methods]A method was established based on QuEChERS pretreatment technology combined with HPLC-MS/MS to determinate the residue of isopyrazam in soil.The samples were extracted with 5 mL of pure water and 10 mL of acetonitrile,and purified by 50 mg of C18.Through laboratory simulative experiments,the effects of soil type and different factors on the degradation of isopyrazam were explored.[Results]The average recovery rate of the method was between 94.79％and 109.59％,the degradation of isopyrazam in different kinds of soil conformed to the first-order kinetic equation,and the degradation rates in 4 kinds of soil were as follows:black soil＞paddy soil＞aquid soil＞red soil.The higher the soil moisture content,the faster the degradation rate;the degradation rate of isopyrazam under anaerobic conditions was higher than that under aerobic conditions,and its half-lives under anaerobic and aerobic conditions were 68.76 and 112.89 d,respectively.Soil sterilization and deorganicism extended its half-life in the soil.[Conclusions]The method established in the test is suitable for detecting the residue of isopyrazam in soil.Soil type,water content,soil sterilization and deorganicism can all affect its degradation in soil,among which soil organic matter content is the main factor affecting the degradation of isopyrazam in soil.
万方数据
维普
