氟环唑在稻田环境中的消解动态研究
2015-10-21戴亮蔡智华
戴亮 蔡智华


摘要 [目的]建立稻田田水、土壤和水稻植株样品中氟环唑的气相色谱分析方法,为正确评价氟环唑在稻田环境中的残留情况提供理论依据。[方法]采用气相色谱分析方法研究了125 g/L氟环唑悬浮剂在水稻及其稻田环境中的消解动态情况。[结果]氟环唑的最小检出量为5.0×10-11 g,最低检测浓度田水为0.005 0 mg/kg、土壤为0.012 5 mg/kg、植株为0.025 0 mg/kg。当添加浓度在0.025 0~1.000 0 mg/kg时,氟环唑在不同样品中的平均回收率为78.5%~101.1%,标准偏差为2.0%~9.0%。氟环唑在田水、稻田土壤和水稻植株中的消解遵循一级化学反应动力学方程,平均消解半衰期分别为3.55、15.00、4.50 d。[结论]氟环唑在稻田田水、土壤、植株中消解均较快,属于易消解农药。
关键词 氟环唑;水稻;消解动态;气相色谱
中图分类号 S482.2 文献标识码
A 文章编号 0517-6611(2015)05-137-03
Degradation Dynamics of Epoxiconazole in Rice and Paddyfield
DAI Liang1, CAI Zhihua2, GUO Zhengyuan1* (1. College of Resources and Environment, Hunan Agricultural University, Changsha, Hunan 410128; 2. Yiyang Agriculture Bureau, Yiyang, Hunan 413000)
Abstract [Objective] One GC analysis method for determination of Epoxiconazole in rice and paddyfield was established to provide theoretical basis for the evaluation of Epoxiconazole residue in paddyfield. [Method] The degradation dynamics of 125 g/L Epoxiconazole SE in rice and paddyfield were studied by using GC analysis method. [Result] The minimum detectable amount of epoxiconazole was g; and the minimum detectable concentration of paddy water, soil and rice plant were 0.005 0, 0.012 5 and 0.025 0 mg/kg, respectively; when adding concentration was 0.025 0-1.000 0 mg/kg, the average recovery rate of Epoxiconazole in different samples were 78.5%-101.1%, and the RSD ranged from 2.0% to 9.0%; the degradation dynamics of Epoxiconazole in paddyfield water, paddyfield soil and plant accorded with the first order chemical reaction kinetic equation, and their average halflife were 3.55, 15.00 and 4.50 days, respectively. [Conclusion] Epoxiconazole degraded fast in paddyfield water, paddyfield soil and plant, so it belonged to an easy degraded pesticide.
Key words Epoxiconazole; Rice; Degradation dynamics; GC
基金項目 农业部药检所项目。
作者简介 戴亮(1989- ),男,湖南衡阳人,硕士研究生,研究方向:环境污染物检测技术。*通讯作者,副教授,博士,硕士生导师,从事环境污染物检测技术研究。
收稿日期 20141222
氟环唑是一种由德国巴斯夫公司研发的具有预防和防治效果的三唑类广谱杀菌剂[1]。一般的杀菌剂药效普通,杀菌能力弱,而广谱杀菌剂不仅是一种能防治多种病害的杀菌剂,还能与多种杀菌剂组合配方,其杀菌效果更强,药效更是普通杀菌剂的数倍[2]。氟环唑不仅对一系列禾谷类作物如立枯病、白粉病、眼纹病等十多种病害具有良好的防治作用,还能防治糖用甜菜、花生、油菜、草坪、咖啡及果树等植物上的病害。氟环唑内吸性强,可迅速被植株吸收并传导至感病部位,使病害侵染立即停止。……
