两种拟除虫菊酯类杀虫剂对萼花臂尾轮虫的急性毒性研究

[目的]研究常见拟除虫菊酯类杀虫剂氯氰菊酯和溴氰菊酯对轮虫的24、48 h急性毒性大小。[方法]以广州品系萼花臂尾轮虫为受试动物,采用标准毒性试验方法进行急性毒性试验,机率单位法测定氯氰菊酯和溴氰菊酯对轮虫的LC50值。[结果]氯氰菊酯对萼花臂尾轮虫的24、48 hLC50分别为3 376.87、5.87μg/L;溴氰菊酯对萼花臂尾轮虫的24、48 hLC50分别为594.56、74.17μg/L。[结论]氯氰菊酯和溴氰菊酯对轮虫24、48 h的急性毒性大小不同;氯氰菊酯和溴氰菊酯对轮虫的48 hLC50值比其24 hLC50值用来监测水体中的此类化学污染物更为敏感。

Acute Toxicity of Two Pyrethroid Pesticides to Brachionus calyciflorus

[Objective]The paper was to study the 24 and 48 h acute toxicity of common pyrethroid pesticides of cypermethrin and deltamethrin to Brachionus calyciflorus.[Method]With Guangzhou strain of B.calyciflorus as test animal,the standard toxicity test method was used to carry out acute toxicity test,and LC50 of cypermethrin and deltamethrin to rotifer was determined using probability unit method.[Result]24 or 48 h LC50 of cypermethrin to rotifer was 3 376.87 and 5.87 μg/L,and those of deltamethrin to rotifer was 594.56 and 74.17 μg/L,respectively.[Conclusion]Acute toxicity of cypermethrin and deltamethrin on rotifer to 24 and 48 h was different,48 h LC50 of cypermethrin and deltamethrin to rotifer was more sensitive than 24 h LC50 on monitoring this chemical contamination in water body.