Faculty of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, 265-1 Higashijima, Niigata, Niigata 956-8603, Japan.
Bull Environ Contam Toxicol. 2012 Nov;89(5):985-9. doi: 10.1007/s00128-012-0793-6. Epub 2012 Aug 23.
Behavior of the herbicide pyrazolynate, 4-(2,4-dichlorobenzoyl)-1,3-dimethylpyrazol-5-yl p-toluenesulfonate, in paddy water and soil after application to paddy fields was investigated to evaluate the hydrolyzation to destosyl pyrazolynate (DTP), 4-(2,4-dichlorobenzoyl)-1,3-dimethyl-5-hydroxypyrazole. The respective maximum concentrations of pyrazolynate and DTP were 440-1,240 and 200-260 μg/L, respectively, in the paddy water, and 610-860 μg/kg dry and 460-730 μg/kg dry in the paddy soil. The applied pyrazolynate was drained from the paddy fields as DTP. The runoff ratios of DTP from the paddy fields were calculated as 19 % ± 14 %. The respective mean values of the half-lives of pyrazolynate and DTP were 0.87 ± 0.091 and 17 ± 1.4 days in the paddy water and 2.2 ± 0.70 and 26 ± 2.1 days in the paddy soil, respectively.
在稻田中使用除草剂吡唑草酯（4-(2,4-二氯苯甲酰基)-1,3-二甲基吡唑-5-基对甲苯磺酸盐）后，研究了其在稻田水中和土壤中的行为，以评估其水解为敌草隆（DTP），4-(2,4-二氯苯甲酰基)-1,3-二甲基-5-羟基吡唑的情况。在稻田水中，吡唑草酯和 DTP 的最大浓度分别为 440-1,240 和 200-260 μg/L，在稻田土壤中，吡唑草酯和 DTP 的最大浓度分别为 610-860 μg/kg 干重和 460-730 μg/kg 干重。施用到稻田中的吡唑草酯作为 DTP 被排出。从稻田中流失的 DTP 比例计算为 19%±14%。吡唑草酯和 DTP 在稻田水中的半衰期平均值分别为 0.87±0.091 和 17±1.4 天，在稻田土壤中的半衰期平均值分别为 2.2±0.70 和 26±2.1 天。
