溶解的巴会对地下水产生毒性 环虫
Merrin S Adams1, Kitty S McKnight1,2, David M Spadaro1
1CSIRO Environment, Lucas Heights, New South Wales, Australia.
Environmental toxicology and chemistry
|August 13, 2024
概括
地下水中的高 (Ba) 对水生生物构成风险. 这项研究发现溶解的Ba对地下水甲类有毒,而沉的Ba则不是,为风险评估提供了信息.
科学领域:
- 环境毒理学环境毒理学
- 水文地质学 水文地质学
- 生态毒理学 生态毒理学
背景情况:
- (Ba) 在地下水中的溶解和调动主要由硫酸盐控制,这是由于硫酸盐 (BaSO4) 溶解度低.
- 地下水中的Ba度升高可能源于人为活动和地质源.
- 目前没有关于地下水生物 (stygofauna) 的Ba毒性数据.
研究的目的:
- 评估对来自澳大利亚新南威尔士州的两种stygobiont cyclopoid物种的毒性.
- 为了确定硫酸盐度对毒性的影响.
- 评估溶解巴度升高对地下水生态系统的风险.
主要方法:
- 在28天的时间里,对两种stygobiont cyclopoid物种进行了Ba的毒性测试.
- 在不同硫酸盐度 (<1-100毫克SO4/L) 的水域进行的实验.
- 测量旋体生存率和观察BaSO4降水动态.
主要成果:
- 溶解的Ba对环类有毒,而沉的Ba对惠灵顿物种没有毒性.
- 溶解Ba的毒性值包括21天无效度为3.3 mg/L,有效度为4.8 mg/L,死亡率为5%.
- 硫酸盐的存在导致了快速的BaSO4沉,减少溶解的Ba,直到硫酸盐耗尽.
结论:
- 高度的溶解Ba度可能对地下水生物构成重大风险.
- 为全面的风险评估,建议对各种类型的虫生物进行进一步的毒性测试.
- 制定用于地下水污染物风险评估的Ba指导值至关重要.
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