摘要
为评价氨唑草酮的环境安全性,参照国家标准GB/T 31270—2014的要求,采用室内模拟法研究了氨唑草酮在不同温度和不同pH值缓冲溶液中的水解特性、在不同环境介质中的挥发特性,以及在2种水-沉积物系统中的降解特性。结果表明:氨唑草酮在25℃时,在pH值为4或7的缓冲液中水解半衰期均长于365 d,在pH值为9的缓冲液中水解半衰期为90.0 d,属于难水解至中等水解农药。在20~25℃、气体流速500 mL·min-1的条件下,氨唑草酮在空气、水和土壤中的挥发率均小于1%,属于难挥发农药。氨唑草酮在湖泊(杭州西湖)水-沉积物系统和河流(京杭大运河)水-沉积物系统中的降解符合一级动力学方程,好氧降解半衰期分别为408 d和630 d,厌氧降解半衰期分别为248 d和990 d,在水-沉积物系统中属于难降解农药。
In order to evaluate the risk of amicarbazone in the environment,the hydrolysis,volatility and degradation characteristics of amicarbazone in water,soil and water-sediment system were investigated by laboratory tests according to the national standard GB/T 31270—2014.At 25℃,the half-life periods of hydrolysis were>365 d,>365 d and 90 d in buffer solutions with pH of 4,7,and 9,respectively.The volatility rate of amicarbazone in air,water and soil was less than 1%under the conditions of 20-25℃and 500 mL·min-1 gas flow rate,which suggested amicarbazone was difficult to volatilize.The degradation of amicarbazone in lake(West Lake)and river(Grand Channel)water-sediment system accorded with the first-order kinetic equation.The degradation half-life period of amicarbazone in lake and rive water-sediment system was 408 d and 630 d,respectively,in aerobic conditions,and was 248 d and 990 d,respectively,in anaerobic conditions.These results indicated that amicarbazone was hard to degrade in water-sediment system.
作者
何开雨
汤涛
宣彩迪
吴园园
何红梅
吴珉
赵学平
徐霞红
王强
HE Kaiyu;TANG Tao;XUAN Caidi;WU Yuanyuan;HE Hongmei;WU Min;ZHAO Xueping;XU Xiahong;WANG Qiang(State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products(in Prepared),Key Laboratory for Pesticide Residue Detection of Ministry of Agriculture and Rural Affairs,Institute of Quality and Standard for Agro-Products,Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China)
出处
《浙江农业学报》
CSCD
北大核心
2019年第12期2057-2063,共7页
Acta Agriculturae Zhejiangensis
基金
省部共建农产品质量安全国家重点实验室开放课题(2010DS700124-KF1911)
关键词
氨唑草酮
水解
挥发性
降解
水-沉积物系统
amicarbazone
hydrolysis
volatility
degradation
water-sediment system
