在联合暴露下,重金属对毒性,生物度和生物放大效应的显著增强
Qian Cheng1, Jin Zhang1, Bi-Ya Dai1
1Key Laboratory of Water Pollution Control and Wastewater Resource of Anhui province, Hefei, 230601, PR China; College of Environment and Energy Engineering, Anhui Jianzhu University, Hefei, 230601, PR China.
Comparative biochemistry and physiology. Toxicology & pharmacology : CBP
|September 10, 2025
概括
在水生生态系统中重金属的共同污染存在风险. 这项研究显示,金属毒性和生物放大与组件数量相结合而增加,和是关键驱动因素.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 水生毒理学 水生毒理学
背景情况:
- 重金属 (HM) 的共同污染在水生环境中很普遍.
- 联合HM暴露可能导致复杂的协同或对抗作用,影响食物链和人类健康.
- 了解这些对水生食物链的综合影响至关重要,但仍然有限.
研究的目的:
- 在各种联合暴露条件下,系统地研究 (Pb), (Cd), (Ni) 和 (Zn) 的毒性反应,生物度和生物放大.
- 阐明HM相互作用背后的机制及其对水生生物的影响.
- 为对多重HM污染的生态风险评估提供参考.
主要方法:
- 研究水生生物对四种HM (Pb,Cd,Ni,Zn) 单次和联合暴露的有毒反应.
- 分析了活性氧物种 (ROS) 生产,膜完整性和叶绿素含量,以了解毒性机制.
- 在食物链中的量化生物度和生物放大因子 (Chlorella pyrenoidosa到Daphnia magna).
主要成果:
- 综合的HM毒性明显超过单金属效应,随着所涉及金属的数量增加 (四元化>三元化>二元化>单).
- Cd-Ni组合显示出最强的毒性,表明显著的协同效应.
- 暴露于HM破坏了氧化还原平衡和光合作用功能,放大了毒性. 碳酸和显示出明显的生物放大,因子随金属复杂性而增加,并导致联合毒性.
结论:
- 综合HM暴露在水生食物链中放大了毒性和生物放大,其中Cd和Ni是主要的贡献者.
- 金属的数量和类型显著影响毒性和热量转移.
- 这些发现对于评估与复杂的HM污染相关的生态风险至关重要.
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