毒死蜱在小麦植株及土壤环境中的残留特性

通过盆栽试验,利用固相萃取和气相色谱氮磷检测器分析方法研究了有机磷农药毒死蜱在小麦植株及其生长土壤中的残留特性.结果表明:毒死蜱在小麦植株中的降解较快,施药21 d降解率均已超过99%,其中分蘖期比拔节期降解更快,施药14 d降解率已达99.56%,降解规律用指数方程拟合得不够好;毒死蜱在盐碱土中的降解比在通常的生长土壤中快得多,平均半衰期为11.04 d,其中在拔节期比在分蘖期土壤中降解快,降解规律符合指数方程.毒死蜱在低浓度下降解的半衰期相对更长.

The Residual Property of Chlorpyrifos in Wheat Seedling and Soil

The pot cultivation experiment method, integrated with SPE & GC-NPD, was developed for exploring the residual property of chlorpyrifos in wheat and soil. The results show that chlorpyrifos is easy to be degraded in wheat seedlings. The degradation rates are more than 99% after 21 days. The rate in the tillingstage is 99.56% after 14 days and it is higher than in the jointing stage. Thedegradation laws in wheat seedlings do not coincide with exponential expression.The degradation of chlorpyrifos in saline-alkaline soil is much faster than that in general vegetative soil and the average half-life in the soils is 11.04 days. In contrast, the degradation in the jointing stage is faster than that in theother and the laws coincide with exponential equation. The half dissipation time of chlorpyrifos in lower concentration is relatively longer than that in higher concentration.