Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, 110012, India.
Bull Environ Contam Toxicol. 2012 Mar;88(3):338-43. doi: 10.1007/s00128-011-0457-y. Epub 2011 Nov 6.
Persistence behavior of two combination mix formulations of insecticides viz. profenofos + cypermethrin (Roket 44EC) and chlorpyrifos + cypermethrin (Nacraj-505) were studied in eggplant fruits following spray application at recommended and double dose. Half-life values were calculated from first order dissipation kinetics, in case of Roket 44EC, residues of cypermethrin on fruits dissipated with half-life of 2.15-2.31 days, whereas residues of profenofos dissipated with the half-life of 0.91-1.86 days. Profenofos residues persisted beyond 7 days in soil, whereas residues of cypermethrin were below detection limit on 0-day itself. Dissipation of chlorpyrifos residues in the combination mix with cypermethrin (Nacraj-505) followed first order kinetics with the half-life values of 3.27-3.10 days. In soil, chlorpyrifos residues were below detectable limit even on 0-day at recommended dose of application. More than 90% dissipation was recorded on 7 day, although residues persisted beyond 15 days at double the recommended dose. Half life of dissipation for cypermethrin calculated from first order dissipation kinetics varied from 2.19 to 3.27 days. In soil, no residues of cypermethrin were detected even on 0-day at recommended dose.
研究了两种杀虫剂组合配方（即：丙溴磷+氯氰菊酯（Roket 44EC）和毒死蜱+氯氰菊酯（Nacraj-505））在茄子果实上推荐剂量和双倍剂量喷雾处理后的持久性行为。根据一级消解动力学计算半衰期值，在 Roket 44EC 的情况下，氯氰菊酯在果实上的残留量以半衰期 2.15-2.31 天的速度消解，而丙溴磷的残留量以半衰期 0.91-1.86 天的速度消解。丙溴磷的残留量在土壤中超过 7 天，而氯氰菊酯的残留量在 0 天就低于检测限。氯氰菊酯与毒死蜱的组合配方中（Nacraj-505）的氯氰菊酯残留量遵循一级动力学，半衰期值为 3.27-3.10 天。在土壤中，即使在推荐剂量的应用下，在 0 天也检测不到氯氰菊酯的残留。在 7 天记录了超过 90%的消解，尽管在推荐剂量的两倍时残留量超过 15 天。根据一级消解动力学计算的氯氰菊酯消解半衰期值从 2.19 到 3.27 天不等。在土壤中，即使在推荐剂量下，在 0 天也未检测到氯氰菊酯的残留。
