乙虫腈及其代谢产物在稻田中的残留消减动态研究

采用加速溶剂萃取提取、florisil固相萃取小柱净化、气相色谱（电子捕获检测器）测定的方法，研究了江苏南京、江西南昌和福建永泰3地稻田施用乙虫腈农药后，乙虫腈农药及其代谢产物在水稻植株、田水和土壤中的残留消减动力学规律，以及在水稻植株、土壤、稻壳和糙米中最终残留情况。结果表明，乙虫腈母体在南京、南昌和永泰3地水稻植株、土壤、和稻田水中的消减半衰期分别为3．0、4．1和8．3d，9．2、16．9和9．9d，2．8、6．9和10．9d；母体和代谢产物总量在南京、南昌和永泰3地水稻植株、土壤、和稻田水中的消减半衰期分别为8．5、8．2和4．0d，37．1、58．2和20．2d，4．4、8．2和10．8d。在稻田中按照最高推荐剂量和最高推荐剂量1．5倍施用乙虫腈，施药1~2次时，在收获的糙米中乙虫腈的均未检出。

Study on residue decline dynamics of ethiprole and its metabolic products in paddy field

Dissipation dynamics of ethiprole and its metabotites in rice, rice hull, rice plant, paddy soil and water were studied in 3 fields sprayed with the pesticide located at Nanjing, Nanchang, and Yongtai. Their eventual residues in rice plant, rice, and rice hull, paddy soil and water were also explored. Samples were extracted with accelerated solvent extraction （ASE）, followed by Florisil column cleanup. Analytes were quantified by gas chromatography （GC） with electron capture detection. Results showed that the half-life times of ethiprole in plant, paddy water, and soil were approximately 3.0, 4.1 and 8.3 d; 9.2, 16.9 and 9.9 d; 2.8, 6.9 and 10.9 d in Nanjing, Nanchang and Yongtai. The half-life of total amount of ethiprole and its metabolic products in plant, water and soil was approximately 8.5-8.2 d and 4.0, 37.1,58.2 d and 20.2,4.4, 8.2 d and 10.8 d at Nanjing, Nanchang and Yongtai, respectively. When a paddy filed was sprayed with ethiprole at the dose of 1.5 times of the highest recommended value, no residue of the substance was detected in rice.