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首页> 外文OA文献 >Phytofiltration of arsenic and cadmium by using an aquatic plant, Micranthemum umbrosum: Phytotoxicity, uptake kinetics, and mechanism
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Phytofiltration of arsenic and cadmium by using an aquatic plant, Micranthemum umbrosum: Phytotoxicity, uptake kinetics, and mechanism

机译：使用水生植物Micranthemum umbrosum对砷和镉进行植物滤除：植物毒性，吸收动力学和机理

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Arsenic (As) and cadmium (Cd) are noxious and carcinogenic pollutants that can be removed from water by using emerging, ecofriendly, phytofiltration technology that employs Micranthemum umbrosum. After culturing M. umbrosum for 7 days in a hydroponic experiment, accumulation of 1219±44.11 µg As g−1 and 799.40±30.95 µg Cd g−1 were observed in the leaves, from 1000 µg As L−1 and 1000 µg Cd L−1 of water, respectively. Plant and water samples were analyzed for assessing the As and Cd accumulations, translocations, phytotoxic effects, uptake mechanisms and kinetics, and for evaluating the potential of M. umbrosum in As and Cd phytofiltration. The uptake pattern was leaf>stem>root for both pollutants. The plant showed higher resistance to As than to that to Cd. Uptake of inorganic As species was much greater than that of organic As and was found at above the substrate concentration. However, Cd showed similar uptake pattern to that of inorganic As species, and the data was better fit to a non-linear than a linear model. Low molecular weight substances that have thiol group(s) may be responsible for the binding of As in plants whereas Cd showed a different mechanism to that of As. M. umbrosum showed good As phytofiltration capabilities without any phytotoxic effects, but it was found to be a moderate accumulator of Cd with some phytotoxic effect compare to some other previously studied plant.
机译：砷（As）和镉（Cd）是有毒的致癌污染物，可以通过采用采用Micranthemum umbrosum的新兴，生态友好型植物过滤技术从水中去除。在水培实验中培养芒草7天后，从1000 µg As L-1和1000 µg Cd L中观察到1219±44.11 µg As g-1和799.40±30.95 µg Cd g-1的积累。 -1的水。分析了植物和水样，以评估砷和镉的积累，易位，植物毒性作用，吸收机理和动力学，并评估伞形支原体在砷和镉的植物过滤中的潜力。两种污染物的吸收方式为叶>茎>根。该植物对砷的抗性高于对镉的抗性。无机砷物质的吸收远大于有机砷的吸收，并且发现其吸收浓度高于底物浓度。但是，Cd的吸收模式与无机As的吸收模式相似，因此与线性模型相比，数据更适合非线性。具有硫醇基团的低分子量物质可能是植物中As结合的原因，而Cd与As的机理不同。 M. umbrosum表现出良好的As植物过滤能力，没有任何植物毒性作用，但是与以前研究过的其他植物相比，它是Cd的中等蓄积体，具有一定的植物毒性作用。

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