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.pdf

2015,34(8):1493-1497
农业环境科学学报
2015年8月
Touma! of Agro- Environment cience
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
管磊,张鹏,王晓坤,任玉鹏,郭贝贝,刘峰
(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)
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。结表明:在紫外光下,吡唑
醚菌酯在0.80~-10.00mg?L1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H1020.03-794mml-L'内,光解速率随着HO2浓度
的增大而增大,在7,94 mmoll.时是毗唑謎菌酯单独光解的1.14倍。20%吡唑醚菌酯微悬浮剂在2.00、4.00、10,0mgL浓度
下,紫外光照射132h的光解率低于57.90%,表明徴囊化明显降低了吡唑陸菌酯在水中的光降解速率。研究结果将为吡唑菌酯的
合理使用和评估其在水体中的安全风险提供依据。
关键词:吡唑醚菌酯;水环境;光化学降解;半衰期;微化
中图分类号:X820.3文献标志码:A文章编号:1672-2043(2015)08-1493-05doi:l0.1654jaes.2015.08.009
Photodegradation of Pyraclostrobin in water Environment and Microencapsulation Effect on Its Photostability
GUAN Lei, ZHANG Peng, WANG Xiao-kun, REN Yu-peng, GUO Bei-bei, LU Feng
College of Plant Protection, Shandong Agricultural University, Key Ia rory of Pesticide Toxicology and Application Technique,Tai'an
271018, China)
Abstra Pho ode rada on and photo ability of chemicals have profound impacts on their effectiveness and ecotoxicity. This study investi
ated the photode radation of pyraclostrobin in water environment and the effect of microencapsulation on its photostability under irradiation
of lamp. The photochemical e aa o f a n b aa ized by f-order k eti qua ion and was negatively c-
related with its in t al co ions f .800 m. The de aa on rates of p raclsrbin n different types of water were in
quence of deionized waer> a wae>pond wat>u d inking w>ver war. e hotcemical degradation increased as H202
concentrations increased from 0.03 mmol L o 7. 94 mm] In the eames with 94 mmol H 0 mg L the photolysis rate was 1.14
times higher than in the control. Micrencapsulation decreased the ho degradation of pyraclostrobin in water. The photolysis rates of 20%
pyraclostrobin microcapsule suspension(S)at 2.00, 4.00 mgl,and 10.00" were less than 57.90%after 132 h. These results
would advance our understanding of rensonable application and environmental safety assessment of pyraclostrobin
Keywords: pyraclostrobin water environment; photodegradation; half-life; microenuapsulaliur
农药在生产加工以及应用过程中,不可避免地通过食物链的富集作用对动物和人类健康造成危害。农
过多种途径流人附近水体中,直接对水生生物以及通药在环境中的行为包括降解、代谢、残留、毒性和环境
污染问题,而农药在水环境中光化学降解(简称光解
是其在水中主要的降解方式之一,降解产物和降解快
收精日期:2015-02-13
甚金项目:公益性行业(农业)科研专项(201303027)
慢等因素影响农药在环境中的残留并可能对水生生
作者筒介:管磊(1989),男,山东蒙阴人,硕土研究生,主要从事农物以及人类健康带来危害。农药在水环境中光解已
药制剂加工与应用技术。E- mail qd uanlei?1989@126com
是环境化学及环境毒理学的研究热点之ー-P。此外,
*通信作者:刘峰E-mfil:iu@ada.edu.cn
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