农业环境科学学报Issue(4)：653-659,7.DOI:10.11654/jaes.2015.04.007
腐植酸影响扑草净对斑马鱼的急性毒性研究
Influence of Humic Acid on Acute Toxicity of Prometryn to Danio rerio
摘要
Abstract
Humic acid (HA)is a principal component of dissolved organic matters in all aquatic ecosystems. It comprises of a variety of molecular structures and functional groups and can bind pollutants in the water, thereby affecting the pollutant toxicity to aquatic organisms. In this study, a triazine herbicide prometryn, commonly present in the surface and ground water, was chosen as the target pollutant and a model organism zebrafish(Danio rerio)as the target organism. The aim of this study was to investigate the acute toxicity of prometryn to Danio rerio at 5 and 15 mg·L-1 HA concentrations. Under single prometryn exposure, the 24 h, 48 h, 72 h, and 96 h median lethal concen-trations(LC50)of prometryn to Danio rerio were 9.143, 8.432, 7.645, and 7.448 mg·L-1 and 95%confidence intervals were 8.635~9.861, 7.408~9.934, 7.041~8.310, and 7.032~7.971 mg·L-1, respectively. Based on these acute toxic experiment results, prometryn had the high toxicity to Danio rerio. In addition, 96 h cumulative mortality rate of Danio rerio did not change obviously with 5 mg·L-1 HA when the con-centrations of prometryn were 6.5, 7.5, and 8.5 mg·L-1. In contrast, the same toxicological parameter became 40%higher at 15 mg·L-1 HA than HA-free when prometryn concentration was 8.5 mg·L-1. It was shown that HA can increase the acute toxicity under higher prometryn concentrations. This might be explained by a hypothesis that the association of prometryn with DOM reducing its toxicity might be overshad-owed by other mechanisms actually enhancing its toxicity in water.关键词
腐植酸/扑草净/急性毒性/斑马鱼Key words
humic acid(HA)/prometryn/acute toxoticy/zebrafish(Danio rerio)分类
资源环境引用本文复制引用
赵倩,王灿灿,袁旭姣,朱琳..腐植酸影响扑草净对斑马鱼的急性毒性研究[J].农业环境科学学报,2015,(4):653-659,7.基金项目
国家水体污染控制与治理科技重大专项 （）
