水生生物在评价微生物水质改良剂的生态毒性中的应用

Ecotoxicity assessment on microbial water purifying agents by aquatic organism

目的探讨微生物型水质改良剂对斑马鱼和大型溞的急性毒性,为其安全使用提供依据。方法将斑马鱼、大型溞分别暴露于不同浓度的水质改良剂稀释液中48 h,用概率单位图解法计算受试物对两种生物24 h、48 h的半数致死浓度(LC_(50))。结果受试物对斑马鱼24、48 h的LC_(50)分别为15.66%和9.85%,对大型溞24、48 h的LC_(50)分别为6.30%和3.13%。结论微生物水质改良剂对斑马鱼及大型溞的急性毒性作用较小,但对其慢性毒性仍需进行研究。

[Objective] To investigate the acute toxicity effects of microbial water purifying agents on zebrafish and daphnia magna, provide the basis information for its safety in use. [ Methods ] Zebrafish and daphnia magna were exposed to the different concentration testing diluents water for 48 hours, and the profit-logarithm graphical method was used to calculate the Lethal Concentration 50 （LC50） for both 24 hours and 48 hours. [ Results ] At the exposure endpoint of 24 hours and 48 hours, the LC50 value for zebrafish was 15.66% and 9.85% respectively. As for the daphnia magna, the 24 hours LCso value was 6.3% and the 48 hours LC50 was 3.13%. [Conclusion] The acute toxicity of microbial water purifying agents is low in zebrafish and daphnia magna, however, its chronic toxicity is still unclear and needs further study.