Centre technologique des résidus industriels en Abitibi Témiscamingue, 433 boulevard du collège, Rouyn-Noranda, J9X 0E1, Canada.
Centre Eau, Terre et Environnement, Institut national de la recherche scientifique, Université du Québec, 490 rue de la Couronne, Québec, G1K 9A9, Canada.
Environ Sci Pollut Res Int. 2021 Sep;28(36):50799-50812. doi: 10.1007/s11356-021-14335-1. Epub 2021 May 10.
The speciation, behaviour, and bioavailability of released selenium (Se) from mine effluent discharge to sediments and plants were assessed. Discharged mine effluent containing 65±0.9 μg/L of total Se subsequently contaminated the exposed sediment with an average total Se concentration of 321 mg/kg as well as exposed Typha latifolia plants where 534 and 92 mg/kg were found in roots and leaves, respectively. The strategy of T. latifolia in Se phytoremediation consisted of a phytostabilization and accumulation of Se predominantly in roots. Se plant root uptake was promoted by synergistic effects of Cu, Pb, Zn, and Cd while Co, Fe, Mn, Ni, Na, K, and Mg had antagonistic effects. Se plant uptake was also governed by sediment characteristics mainly pH, total Se, and iron concentration. Se speciation results demonstrated that the most accumulated Se species by T. latifolia roots were selenite and selenomethionine with average concentrations of 2.68 and 2.04 mg/kg respectively while other Se species were the most translocated (average translocation factor of 1.89). Se speciation in roots was positively correlated with sediment pH, organic matter, electrical conductivity, and iron concentration. This study confirms deploying corrective measures for mine effluent treatment before discharge in a sediment-plant environment to protect living organisms from toxic effects. T. latifolia is recommended as a Se-hyperaccumulator to be used for mine soil phytoremediation in cold regions in Canada.
评估了从矿山废水排放到沉积物和植物中释放的硒（Se）的形态、行为和生物可利用性。含有 65±0.9μg/L 总硒的排放矿山废水随后污染了暴露的沉积物，总硒浓度平均为 321mg/kg，以及暴露的香蒲植物，根和叶中分别发现了 534 和 92mg/kg 的总硒。香蒲植物修复硒的策略包括硒的植物稳定化和积累，主要在根部。Cu、Pb、Zn 和 Cd 的协同作用促进了 Se 的植物根部吸收，而 Co、Fe、Mn、Ni、Na、K 和 Mg 则具有拮抗作用。Se 的植物吸收也受到沉积物特性的控制，主要是 pH 值、总 Se 和铁浓度。Se 形态结果表明，香蒲植物根部积累最多的 Se 形态是亚硒酸盐和硒代蛋氨酸，平均浓度分别为 2.68 和 2.04mg/kg，而其他 Se 形态的迁移率最高（平均迁移因子为 1.89）。根部的 Se 形态与沉积物 pH 值、有机质、电导率和铁浓度呈正相关。本研究证实，在沉积物-植物环境中，在排放前采取措施处理矿山废水，以保护生物免受毒性影响。建议将香蒲作为一种硒超积累植物，用于加拿大寒冷地区的矿山土壤修复。
