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为明确苄嘧磺隆和苯噻酰草胺在稻田系统中的使用安全性,于2010、2011年在杭州、长沙和南宁进行田间试验,研究苄嘧磺隆·苯噻酰草胺0.42%颗粒剂在水稻中的消解动态和最终残留。结果表明,在稻田土壤、水、糙米、谷壳和水稻植株中添加的苄嘧磺隆和苯噻酰草胺的平均回收率为70.78%~116.06%,相对标准偏差(RSD)为0.91%~10.24%;苄嘧磺隆和苯噻酰草胺的检出限(LOD)均为0.02 mg/L,最小检出量均为4.0×10~(-9) g。在水稻移栽后5~7 d,采用直接撒施法在高剂量(270 kg/hm~2,其中苄嘧磺隆有效成分为64.8 g/hm~2,苯噻酰草胺有效成分为1 069.2 g/hm~2)下施药1次的消解动态试验结果表明:苄嘧磺隆和苯噻酰草胺在稻田水、稻田土壤和水稻植株中的消解动态曲线均符合一级动力学方程,苄嘧磺隆在稻田水、稻田土壤和水稻植株中的平均消解半衰期分别为5.35,3.05和3.71 d,苯噻酰草胺在稻田水、稻田土壤和水稻植株中的平均消解半衰期分别为3.61,3.29和3.88 d。分别按低剂量(180 kg/hm~2,其中苄嘧磺隆有效成分为43.2 g/hm~2,苯噻酰草胺有效成分为712.8 g/hm~2)和高剂量(270 kg/hm~2)施药1次,在正常收获期采集的稻田土壤、稻杆、谷壳和糙米中均未检测出苄嘧磺隆和苯噻酰草胺。
In order to clarify the safety of bensulfuron-methyl and phenylthiocarb in paddy field system, field experiments were conducted in Hangzhou, Changsha and Nanning in 2010 and 2011 to study the effect of bensulfuron-phenylthiocarbamide 0.42% Disinfection dynamics and final residue of the agent in rice. The results showed that the average recoveries of bensulfuron and phenoxybenzamide from paddy soil, water, brown rice, chaff and rice plants ranged from 70.78% to 116.06% with relative standard deviations (RSDs) of 0.91% The detection limit (LOD) of bensulfuron-methyl and phenylthiocarb was both 0.02 mg / L and the minimum detection limit was 4.0 × 10 ~ (-9) g. In the 5 ~ 7 d after transplanting, the direct application method in the high dose (270 kg / hm ~ 2, of which the effective content of bensulfuron-based 64.8 g / hm ~ 2, the effective component of benzenethiamide 1 069.2 g / hm ~ 2) showed that the digestion dynamic curves of bensulfuron-methyl and phenothinamide in paddy field, paddy soil and rice plants all fit the first-order kinetic equation, The average digestion half-lives of bensulfuron-methyl in paddy field, paddy soil and rice plants were 5.35, 3.05 and 3.71 d, respectively, and the mean half-lives of diacetylthanamid in paddy field, paddy soil and rice plants were 3.61, 3.29 and 3.88 d. The effects of low dose (180 kg / hm ~ 2, of which the effective content of bensulfuron - methyl was 43.2 g / hm ~ 2 and the active ingredient of benzenethiamide was 712.8 g / hm ~ 2) and high dose ~ 2) once, and no bensulfuron-methyl and phenothinamide were detected in paddy soils, rice straw, chaff and brown rice collected in normal harvesting period.