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首页> 外文期刊>Environmental toxicology and chemistry >Methylmercury Production and Degradation under Light and Dark Conditions in the Water Column of the Hells Canyon Reservoirs, USA
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Methylmercury Production and Degradation under Light and Dark Conditions in the Water Column of the Hells Canyon Reservoirs, USA

机译：美国峡谷水库水柱的光和黑暗条件下的甲基汞生产和降解

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Methylmercury (MeHg) is a highly toxic form of mercury that can bioaccumulate in fish tissue. Methylmercury is produced by anaerobic bacteria, many of which are also capable of MeHg degradation. In addition, demethylation in surface waters can occur via abiotic sunlight-mediated processes. The goal of the present study was to understand the relative importance of microbial Hg methylation/demethylation and abiotic photodemethylation that govern the mass of MeHg within an aquatic system. The study location was the Hells Canyon complex of 3 reservoirs on the Idaho-Oregon border, USA, that has fish consumption advisories as a result of elevated MeHg concentrations. Our study utilized stable isotope addition experiments to trace MeHg formation and degradation within the water column of the reservoirs to understand the relative importance of these processes on the mass of MeHg using the Water Quality Analysis Simulation Program. The results showed that rates of MeHg production and degradation within the water column were relatively low (0.07 d(-1)) but sufficient to account for most of the MeHg observed with the system. Most MeHg production within the water column appeared to occur in the spring when much of the water column was in the processes of becoming anoxic. In the surface waters, rates of photodemethylation were relatively large (up to -0.25 d(-1)) but quickly decreased at depths 0.5 m below the surface. These results can be used to identify the relative importance of MeHg processes that can help guide reservoir management decisions. Environ Toxicol Chem 2021;00:1-11. (c) 2021 SETAC. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
机译：甲基汞（Mehg）是一种浓大的汞形式，可以在鱼组织中生物累积。甲基汞是由厌氧细菌产生的，其中许多也能够降解。此外，表面水中的去甲基化可以通过非生物阳光介导的方法发生。本研究的目的是了解微生物HG甲基化/去甲基化和非生物光脱甲基化的相对重要性，该甲基化治理水生系统内的MEHG质量。研究位置是美国爱达荷州边境边境的3个水库的地狱峡谷综合体，其具有巨大的Mehg浓度升高的鱼类消费咨询。我们的研究利用稳定的同位素添加实验来追踪水库水柱内的MeHG形成和降解，以了解使用水质分析模拟程序对MEHG质量的相对重要性。结果表明，水柱内的MEHG生产和降解的速率相对较低（＆ 0.07d（-1）），但足以考虑用系统观察到的大部分Mehg。在水柱内的大多数Mehg生产在弹簧中出现，当大部分水柱都处于缺氧的过程中。在地表水中，光脱淀粉化率相对较大（高达-0.25d（-1）），但在深度下迅速下降;表面下方0.5米。这些结果可用于确定可以帮助指导储层管理决策的MEHG流程的相对重要性。环境毒素化学2021; 00：1-11。 （c）2021 Setac。本文已被美国政府员工捐款，他们的工作是美国的公共领域。

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