摘要
采用"半静态法"测定了3种农药及其混剂对大型溞的24 h、48 h急性毒性,根据我国《化学农药环境安全评价实验准则》中的毒性等级标准,它们对大型溞的毒性等级如下:精甲霜灵悬浮种衣剂对大型溞的24 h、48 h-EC_(50)均大于10 a.i.mg·L^(-1),属"低毒"级,咯菌腈悬浮种衣剂对大型溞的24 h、48 h-EC_(50)分别是0.339 mg·L^(-1)、0.246 mg·L^(-1),根据0.1 a.i.mg·L^(-1)<EC_(50)(48 h)≤1.0 a.i.mg·L^(-1)判断,属"高毒"级。嘧菌酯水分散粒剂对大型溞的24 h、48 h-EC_(50)分别是0.389 mg·L^(-1)、0.286 mg·L^(-1),根据0.1a.i.mg·L^(-1)<EC_(50)(48 h)≤1.0 a.i.mg·L^(-1)判断,属"高毒"级。精甲霜灵·咯菌腈·嘧菌酯悬浮种衣剂对大型溞的24 h、48 h-EC_(50)分别是0.292 mg·L^(-1)、0.228 mg·L^(-1),根据0.1 a.i.mg·L^(-1)<EC_(50)(48 h)≤1.0 a.i.mg·L^(-1)判断,属"高毒"级。精甲霜灵·咯菌腈·嘧菌酯悬浮种衣剂和嘧菌酯水分散粒剂都属"高毒",但比较具体数值,发现精甲霜灵·咯菌腈·嘧菌酯悬浮种衣剂毒性相对更大,原因是其中还含有"高毒"的咯菌腈。
Semi-static method was applied to determine the 24 h, 48 h-EC50 values of three pesticides and their compounds to Daphnia magna Straus. And according to experimental criteria for environmental safety evaluation of chemical pesticides in China, the 24 h and 48 h-EC50 values of mefenoxam seed coating agent are both above 10 a.i.mg·L-1 so it is of low toxicity. Fludioxonil seed coating agent is highly toxic because its 24 h and 48 h-EC50 values are 0.339 mg. L1 and 0.246 1,2 according to the standard of 0.1 a.i.1,2 〈EC50（48 h） ≤ 1.0 a.i.mg·L-1. Azoxystrobin water dispersible granule is of high toxicity because its 24 h and 48 h-EC50 values are 0.389mg·L-1and 0.286 mg·L-1 according to the standard of 0.1 a.i.mg·L-1 〈EC50（48 h）≤ 1.0 a.i.mg·L-1. Mefenoxarn-fludioxo- nil-azoxystrobin seed coating agent is of high toxicity because its 24 h and 48 h-EC50 values are 0.292 mg·L-1 and 0.228 mg·L-1 according to the standard of 0.1 a.i.mg·L-1 〈EC50（48 h）≤1.0 a.i.mg·L-1. Mefenoxam-fludioxonil- azoxystrobin seed coating agent and azoxystrobin water dispersible granule are both of high toxicity. However, considering the ECs0 values, mefenoxam-fludioxonil-azoxystrobin seed coating agent is more toxic because it contains fludioxonil besides azoxystrobin.
出处
《生态毒理学报》
CAS
CSCD
北大核心
2017年第2期238-242,共5页
Asian Journal of Ecotoxicology
基金
国家自然科学基金(21477152
21277163)
关键词
农药
大型溞
急性毒性
半静态法
pesticide
Daptmia magna Straus
acute toxicity
semi-static method
