摘要
采用气相色谱-电子捕获检测,对芹菜及其土壤中的苯醚甲环唑消解动态和最终残留量进行了研究,评价了苯醚甲环唑在芹菜上使用后的残留行为和环境安全性.苯醚甲环唑在芹菜及土壤中的残留消解动态均符合一级动力学方程,苯醚甲环唑在芹菜上消解快;苯醚甲环唑最终残留量与施药的剂量、施药次数及采样的间隔时间有关;水解研究表明,苯醚甲环唑是稳定的农药,在不同温度和不同pH的研究条件下水解半衰期均大于166d,碱性条件更有利于苯醚甲环唑的降解.
In order to formulate the standards for safe application of difenoconazole in celery, an analytical method was developed using gas chromatography with electron capture detector for the detection and dynamics of the residues of difenoconazole in this paper. The applications of difenoconazole in celery and soil were discussed to evaluate residue behavior and environmental safety of difenoconazole. The results of residual dynamics showed that the dissipation rates of difenoconazole in celery and soil all followed the first order kinetics. The results of the final residue assay indicated that the residue levels of difenoconazole in celery and soil all increased as the application dosage and application times increased, or as the harvest interval decreased. The results of hydrolysis showed that the degradation of difenoconazole in buffer solutions was difficult. The half-life of difenoconazole in solution was more than 166 d. The difenoconazole is degraded easier in basic solution.
出处
《中国科学：化学》
CAS
CSCD
北大核心
2011年第1期129-135,共7页
SCIENTIA SINICA Chimica
关键词
苯醚甲环唑
消解动态
残留
水解
半衰期
difenoconazole, dynamics, residue, hydrolysis, half-life
