在实验室标准准备和分析过程中的[Hg (I) ]物种的转化:对环境分析的影响
Yingying Fang1,2,3, Guangliang Liu4, Ying Wang1,2,5
1Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Environmental science & technology
|April 3, 2024
概括
在稀释溶液中不稳定,在分析过程中不成比例. 建议在有性条件的玻璃容器中进行适当的储存,以确保精确的物种和环境监测.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 的规范 的规范
背景情况:
- (I) (Hg) 在氧还原动力学中起着至关重要的作用,但它的不稳定性使分析复杂化.
- 了解Hg(I) 稳定性对于准确的物种和环境评估至关重要.
研究的目的:
- 在标准的制备和分析程序中调查Hg的稳定性.
- 确定影响Hg (I) 不成比例和氧化还原转换的因素.
- 提供关于在溶液和环境样本中稳定Hg{\displaystyle Hg{\text{I}}) 的建议.
主要方法:
- 对Hg (I) 库存溶液进行重力测量分析.
- 液体染色学-诱导合等离子体质谱学 (LC-ICPMS) 用于稀释HgI分析.
- 密度函数理论 (DFT) 对HgI二分体形成的计算.
- 同位素交换实验 (199Hg>0) aq和 202Hg>II)). 在这些实验中,
- 来自受污染的小溪的环境水样分析.
- 在环境水样中的Hg{\displaystyle Hg{\displaystyle Hg}{\displaystyle Hg{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg}{\displaystyle Hg{\}}
主要成果:
- 在LC-ICPMS分析过程中,Hg (I) 在缩库存溶液中稳定,但在稀释溶液中不成比例.
- 通过对Hg(0) 和Hg(II) 的比例化,Hg(I) 二元体的形成在能量上是有利的.
- 诸如聚烯容器,头部空间,低pH值和高溶解氧气等因素促进HgI不成比例.
- 稀释Hg(I) 可以在没有头部空间的玻璃容器中稳定在轻微的性条件下.
- 在受污染的溪水中发现HgI度升高 (4.4-6.1μg L-1),占总溶解的54-70%.
- 在HgI的样本中验证了HgI的形成,在水生环境 (特别是海水) 中稳定存在至少24小时.
结论:
- 像LC这样的标准分析程序可以诱导HgI不成比例.
- 特定的储存条件 (玻璃,没有头部空间,性pH) 对于保存稀释的HgI溶液至关重要.
- 在某些受污染的水生环境中,Hg(I) 是一种重要的物种.
- (Hg) 可以在自然水中稳定,因此需要在物种研究中考虑它.
- 这些发现提高了对HgI转化的理解,并有助于其环境检测.
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