Influence of pH and Divalent Metals Relevant to California Rice Fields on the Hydroxide-Mediated Hydrolysis of the Insecticide Chlorantraniliprole
作者:Zachary C. Redman、Kathy H. Tran、Sanjai J. Parikh、Ronald S. Tjeerdema
DOI:10.1021/acs.jafc.9b05328
日期:2019.11.13
inhibition in rice field water. The addition of divalent metals was not observed to catalyze the hydrolysis of CAP at pH 6, indicating that the insecticide is likely to remain recalcitrant to hydrolysis in neutral or acidic surface waters. However, Mn2+ and Ni2+ were observed to inhibit hydrolysis at pH 8 and 9. Attenuated total reflectance Fourier transform infrared analysis supports the conclusion
氯氰基丙烯腈(3-溴-N- [4-氯-2-甲基-6-(甲基氨基甲酰基)苯基] -1-(3-氯-2-吡啶-2-基)-1 H-吡唑-5的水解-羧酰胺; CAP)在6-10的pH范围内进行了研究,这反映了加利福尼亚水稻田间的情况,并添加了不同的Cu 2 +,Zn 2 +,Mn 2+或Ni 2+。随着pH值的增加,耗散加速,半衰期从26.9到2.2天不等,在稻田水中略有抑制。在pH 6时未观察到二价金属的添加催化CAP的水解,表明该杀虫剂在中性或酸性地表水中可能仍难以水解。但是,Mn 2+和Ni 2+观察到在pH 8和9时抑制水解。衰减的全反射傅立叶变换红外分析支持以下结论:二价金属可能通过与酰胺氧相互作用而从酰胺氮中撤出电子密度,尽管必须提供额外的量子化学模型以提供进一步的机理见解。总体而言,加利福尼亚稻田及其周围地表水中CAP的水解将受pH值的控制,并受溶解的金属物质的抑制。