溶解有机物和Hg之间的醇介导反应动力学调节Hg的生物可用性:来自全细胞生物传感器和甲基化细菌的证据
Zelin Shen1, Xiaoyan Zhang2, Yingying Guo3
1School of Environment, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China; Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences (UCAS), Beijing 100049, China.
溶解有机物醇通过影响反应动力学来控制的生物可用性. 高醇水平降低了的吸收,特别是当硫化纳米颗粒迅速形成时.
科学领域:
- 环境化学环境化学
- 生物地质化学生物地质化学
- 污染的水银污染情况
背景情况:
- 溶解有机物 (DOM) 醇组是 (II) (Hg (II)) 物种化和生物可用性的关键.
- 不同DOM硫醇丰度对Hg (II) -DOM反应动力学和生物可用性的影响尚未完全理解.
研究的目的:
- 在不同的光照条件下研究受DOM醇丰度影响的Hg(II) -DOM反应动力学.
- 评估这些反应对微生物Hg(II) 吸收和甲基化的影响.
主要方法:
- 使用基于大肠杆菌的全细胞生物传感器测试Hg (II) 的生物可用性.
- 使用一个Geobacter sulfurreducens PCA甲基化试验.
- 在黑暗和光明条件下分析了Hg(II) -DOM反应动力学.
主要成果:
- 随着反应时间的推移,Hg(II) 的生物可用性下降,而高硫醇DOM则显示出更大的抑制作用.
- 形成强大的Hg-thiol复合物或Hg-硫化物纳米粒子 (HgSNP) 解释了生物可用性下降.
- 由于HgSNP形成,光线减少了Hg(II) 在低醇DOM中的生物可用性,而高醇DOM即使在黑暗中也迅速形成了HgSNP.
结论:
- 在水生系统中,DOM硫醇的丰富性对于动态调节Hg (II) 的生物可用性至关重要.
- 这些发现提供了对微生物Hg(II) 吸收和甲基化过程的机制性见解.
- 环境醇水平的变化显著影响循环和毒性.
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