吡唑醚菌酯在水环境中的光解及微囊化对其光稳定性的影响  

Photodegradation of Pyraclostrobin in Water Environment and Microencapsulation Effect on Its Photostability

作　　者：管磊[1] 张鹏[1] 王晓坤[1] 任玉鹏[1] 郭贝贝[1] 刘峰[1] 

机构地区：[1]山东农业大学植物保护学院山东省高等学校农药毒理与应用技术重点实验室,山东泰安271018

出　　处：《农业环境科学学报》2015年第8期1493-1497,共5页Journal of Agro-Environment Science

基　　金：公益性行业(农业)科研专项(201303027)

摘　　要：以紫外灯为光源,研究了吡唑醚菌酯在水环境中光化学降解及微囊化对其光稳定性的影响。结果表明:在紫外光下,吡唑醚菌酯在0.80~10.00 mg·L-1浓度范围内的光解符合一级动力学方程,光解速率与初始浓度呈负相关;吡唑醚菌酯在不同水溶液中的光解速率由大到小依次为去离子水、自来水、池塘水、饮用纯净水和河水;在H2O20.03~7.94 mmol·L-1内,光解速率随着H2O2浓度的增大而增大,在7.94 mmol·L-1时是吡唑醚菌酯单独光解的1.14倍。20%吡唑醚菌酯微囊悬浮剂在2.00、4.00、10.00 mg·L-1浓度下,紫外光照射132 h的光解率低于57.90%,表明微囊化明显降低了吡唑醚菌酯在水中的光降解速率。研究结果将为吡唑醚菌酯的合理使用和评估其在水体中的安全风险提供依据。Photodegradation and photostability of chemicals have profound impacts on their effectiveness and ecotoxicity.This study investigated the photodegradation of pyraclostrobin in water environment and the effect of microencapsulation on its photostability under irradiation of UV lamp.The photochemical degradation of pyraclostrobin could be characterized by first-order kinetic equation and was negatively correlated with its initial concentrations of 0.80 ~10.00 mg·L-1.The degradation rates of pyraclostrobin in different types of water were in sequence of deionized water > tap water >pond water >purified drinking water >river water.The photochemical degradation increased as H2O2 concentrations increased from 0.03 mmol·L-1to 7.94 mmol·L-1.In the treatments with 7.94 mmol H2O2mg·L-1,the photolysis rate was 1.14 times higher than in the control.Microencapsulation decreased the photodegradation of pyraclostrobin in water.The photolysis rates of 20%pyraclostrobin microcapsule suspension(CS) at 2.00,4.00 mg·L-1,and 10.00 mg·L-1were less than 57.90% after 132 h.These results would advance our understanding of reasonable application and environmental safety assessment of pyraclostrobin.

关 键 词：吡唑醚菌酯 水环境 光化学降解 半衰期 微囊化 

分 类 号：X592[环境科学与工程—环境工程]