Department of Earth and Environmental Science, Sejong University, Seoul, Republic of Korea.
J Hazard Mater. 2009 Dec 30;172(2-3):749-54. doi: 10.1016/j.jhazmat.2009.07.059. Epub 2009 Jul 23.
In this study, the mercury (Hg) removal capacities of two aquatic macrophytes, Pistia stratiotes and Azolla pinnata, were investigated against the coal mining effluent. These plants reduced mercury from the effluent via rhizofiltration and subsequent accumulation in plant. The removal rate of P. stratiotes and A. pinnata was 80% and 68%, respectively, after 21 days of exposure to the effluent containing 10 microg L(-1) of Hg. As mercury from the effluent was accumulated in the root and shoot tissues of both aquatic macrophytes, they were proven to be a root accumulator with a translocation factor of less than one during the entire study. The decreasing Hg content in effluent (from 10 to 2.0 microg L(-1)) was reflected by its accumulation in roots (0.57+/-0.02 mg g(-1) in P. stratiotes) and leaves of the experimental plants (0.42+/-0.01 mg g(-1), P. stratiotes). As a result, Hg concentrations in the coal mining effluent were tightly associated with those observed from macrophytes. Considering the high removal efficiencies of Hg by these aquatic macrophytes, these plants can be recommended for the actual treatment of Hg-containing waste waters.
在这项研究中，研究了两种水生植物，水蕹菜和满江红，对煤矿废水的汞（Hg）去除能力。这些植物通过根滤作用和随后在植物中的积累来去除废水中的汞。在 21 天暴露于含 10 μg/L Hg 的废水中后，水蕹菜和满江红的去除率分别为 80%和 68%。由于废水中的汞在两种水生植物的根和茎叶组织中积累，它们在整个研究过程中被证明是一种根累积器，转运因子小于 1。废水中 Hg 含量的降低（从 10 到 2.0 μg/L）反映在实验植物的根（0.57+/-0.02 mg/g，水蕹菜）和叶片（0.42+/-0.01 mg/g，水蕹菜）中的积累。因此，煤矿废水中的 Hg 浓度与从大型植物中观察到的浓度密切相关。考虑到这些水生植物对 Hg 的高去除效率，这些植物可推荐用于实际处理含 Hg 废水。
