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Mo Contamination in Rivers near the Erdenet Mining Area, Mongolia: Field Evidence of High Mobility of Mo at pH >8
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-07-04 , DOI: 10.1021/acsestwater.1c00046
Solongo Tsetsgee 1, 2, 3 , Akihiro Okuyama 1 , Altansukh Ochir 3 , Ariuntungalag Yunden 3 , Enkhjin Odgerel 3 , Taivanbat Batbold 3 , Enkh-Uur Munkhsukd 3 , Yoshio Takahashi 2 , Takashi Munemoto 4 , Masato Honda 5 , Keisuke Fukushi 5
Affiliation  

Although recent research points to Mo as a candidate for anthropogenically induced contamination of natural waters, there has been little research on Mo contamination in river water. The Erdenet mine in Mongolia is the one of the largest Mo mines in the world. Our systematic temporal and spatial monitoring of Mo concentrations in river waters around the Erdenet mine from March to November 2018 showed that in the Khangal River, which is downstream of the Erdenet mining area, Mo concentrations exceeded 70 μg/L (the World Health Organization health-based guideline) during summer. The sources of the Mo in river water are groundwater used for cooling in the Erdenet power plant and seepage from mine tailing ponds. Mo concentrations had a positive correlation with the pH of the river water. Laboratory adsorption experiments confirmed that the pH dependency of Mo concentrations originates from the adsorption/desorption reactions of iron oxide in the river sediments. Mo concentrations in river water were still higher 10 km downstream of the contamination sources. Our observations provided field evidence of high solubility and mobility of Mo in river water that were caused by the lower distribution coefficients of Mo adsorbed on iron oxides in water at pH >8.

中文翻译:

蒙古 Erdenet 矿区附近河流中的 Mo 污染:pH > 8 时 Mo 高迁移率的现场证据

尽管最近的研究指出 Mo 是人为引起的天然水体污染的候选者,但关于河水中 Mo 污染的研究很少。蒙古的额尔登特矿是世界上最大的钼矿之一。2018 年 3 月至 11 月,我们对 Erdenet 矿区周围河水中 Mo 浓度的系统时空监测表明,在 Erdenet 矿区下游的 Khangal 河中,Mo 浓度超过 70 μg/L(世界卫生组织卫生基于指南)在夏季。河水中钼的来源是额尔登特发电厂用于冷却的地下水和矿山尾矿池的渗漏。Mo 浓度与河水的 pH 值呈正相关。实验室吸附实验证实,Mo 浓度的 pH 依赖性源于河流沉积物中氧化铁的吸附/解吸反应。在污染源下游 10 公里处,河水中的钼浓度仍然较高。我们的观察提供了 Mo 在河水中的高溶解度和迁移率的现场证据,这是由于在 pH > 8 时,Mo 吸附在水中的氧化铁上的分配系数较低。
更新日期:2021-08-13
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