杀虫剂
沟渠
毒性
沉积物
环境化学
阿兹特卡海莱拉
环境科学
无脊椎动物
水生生态系统
生态毒理学
毒理
生态学
化学
生物
端足类
古生物学
甲壳动物
有机化学
作者
Peipei Liu,Ling Zhang,Huizhen Li,Wei Wang,Fan Wu,Jing You
标识
DOI:10.1016/j.jhazmat.2022.129292
摘要
Pesticides from agricultural activities transfer to surrounding waterways, jeopardizing aquatic ecosystem. To better characterize transfer of pesticide residues and toxicity, a batch of pesticides were analyzed in 22 sediment samples collected from the ditches (< 5 m away from field) and receiving streams nearby a vegetable planting area, South China. Sum concentrations of pesticides in ditch sediments (152 ± 121 ng/g dry wt.) were higher than those in stream sediments (24.9 ± 14.9 ng/g dry wt.). Toxicity reduction from ditch to stream was different for two invertebrates. Stream sediment toxicity to Chironomus dilutus decreased considerably but elevated toxicity was still observed (50% mortality on average), while stream sediments exhibited no significant lethality to Hyallela azteca (< 10% mortality). Fipronil and its transformation products (FIPs) were responsible for sediment toxicity to the midges, and pyrethroids contributed significantly to the death of the amphipods. Hydrophobic pyrethroids were tended to stay in the ditches, whereas FIPs were detected in stream sediments at considerable concentrations due their possible transfer to the nearby streams and/or residential use. This physicochemical property-related transfer characteristics and intrinsic toxicity of the major toxicants explained the distinct toxicity reduction patterns for the two species, which highlighted their importance in assessing aquatic transfer and risk of agriculture derived pesticides.
科研通智能强力驱动
Strongly Powered by AbleSci AI