藻类有机物抑制了化湖水中的甲基光降解:一项动态研究
Pei Lei1, Jinjie Zhu2, Jin Zhang3
1School of Environment, Nanjing Normal University, Nanjing 210023, China; State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China.
The Science of the total environment
|July 20, 2023
概括
来自分解藻类的藻类有机物 (AOM) 抑制了湖泊中的甲基 (MeHg) 光降解. 这种效应随着分解的进展而减弱,受改变AOM质量和反应性氧物种的影响.
科学领域:
- 环境化学环境化学
- 水生化学 水生化学
- 水银生物地质化学 水银生物地质化学
背景情况:
- 藻类有机物 (AOM) 是优质湖中的溶解有机物中很大一部分.
- 藻类分解期间的AOM动态复杂化了对甲基 (MeHg) 光降解的预测.
- 了解AOM的作用对于评估水生环境中的MeHg风险至关重要.
研究的目的:
- 调查AOM如何影响藻类分解期间的MeHg光降解.
- 描述AOM中的动态变化,并确定反应性氧物种 (ROS) 的作用.
- 阐明AOM对湖泊中MeHg命运的影响背后的机制.
主要方法:
- 研究了AOM对MeHg光降解在不同湖泊类型和优化水平的AOM影响.
- 在藻类分解过程中AOM数量和质量的特征动态变化.
- 量化了基 (·OH),单点氧 (1O2) 和三点溶解有机物 (3DOM*) 对MeHg光降解的贡献.
主要成果:
- AOM显著抑制了MeHg光降解,抑制因湖泊和缩状态而有所不同 (8-28%).
- 随着藻类分解的进展,AOM的抑制作用减少.
- 基 (·OH) 在早期的MeHg光降解中占主导地位,而单基氧 (1O2) 和三基DOM (3DOM*) 后来变得更为重要,所有三种ROS都有所贡献.
结论:
- 来自藻类分解的AOM通过促进其形成和抑制其降解,在增加温湖中的MeHg风险方面发挥着关键作用.
- 在AOM数量和质量的动态变化影响MeHg光降解率.
- 将AOM-MeHg相互作用纳入循环模型对于准确的MeHg风险评估至关重要.
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