Selenium accumulation in aquatic biota downstream of a uranium mining and milling operation.
Selenium accumulation in aquatic biota downstream of a uranium mining and milling operation.
复制标题
铀矿开采和研磨作业下游水生生物群中硒的积累。
DOI：
10.1016/j.scitotenv.2008.10.046
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
D. Janz
中科院分区：
文献类型：
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作者：
Jorgelina Muscatello;D. Janz
铀矿开采和研磨作业有可能将砷、钼、镍、硒和铀等微量元素以及离子（例如硫酸盐、铵）释放到接收水生生态系统中。环境中硒含量升高的主要影响是其在水生食物链中积累的倾向，可能损害鱼类的繁殖。本研究的目的是调查加拿大萨斯喀彻温省北部铀矿上游和下游水生生态系统（湖泊）主要区域中硒的积累情况。尽管水和沉积物浓度较低（干重分别为 0.43 μg/L 和 0.54 μg/g），但暴露湖中水生生物群中的硒浓度升高。硒的生物放大作用导致浮游生物、无脊椎动物和鱼类之间的硒浓度增加约 1.5 至 6 倍。然而，在饲料鱼和掠食性鱼类之间没有观察到生物放大作用。尽管某些水生生物群（例如饲料鱼）超出了建议的鱼类膳食毒性阈值 3 至 11 μg/g（干重）下限，但在该水生系统中未发现硒的不利影响。建议持续进行环境监测，以避免潜在的硒影响。
Uranium mining and milling operations have the potential to release trace elements such as arsenic, molybdenum, nickel, selenium and uranium and ions (e.g., sulfate, ammonium) into the receiving aquatic ecosystem. The major implication of elevated environmental selenium is its propensity to accumulate in the aquatic food chain, potentially impairing fish reproduction. The objective of this study was to investigate the accumulation of selenium in the major compartments of aquatic ecosystems (lakes) upstream and downstream of a uranium mine in northern Saskatchewan, Canada. Selenium concentrations in aquatic biota were elevated in the exposure lake although water and sediment concentrations were low (0.43 μg/L and 0.54 μg/g dry weight, respectively). Biomagnification of selenium resulted in approximately 1.5 to 6 fold increase in the selenium concentration between plankton, invertebrates and fish. However, no biomagnification was observed between forage and predatory fish. Although some aquatic biota (e.g., forage fish) exceeded the lower limit of the proposed 3 to 11 μg/g (dry weight) dietary toxicity threshold for fish, no adverse effects of selenium could be identified in this aquatic system. Continued environmental monitoring is recommended to avoid potential selenium impacts.