摘要
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 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 tilling stage is 99.56% after 14 days and it is higher than in the jointing stage. The degradation 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 the other and the laws coincide with exponential equation. The half dissipation time of chlorpyrifos in lower concentration is relatively longer than that in higher concentration.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2007年第5期105-109,共5页
Research of Environmental Sciences
基金
江苏省应用化学重点学科资助项目(BK2005045)
淮海工学院自然科学基金资助项目(KK04030)
关键词
毒死蜱
小麦
土壤
残留特性
chlorpyrifos
wheat seedling
soil
residual property
