a Botany and Microbiology Department , Faculty of Science, Helwan University , Cairo , Egypt.
b Botany Department , Faculty of Science, Kafr El-Sheikh University , Kafr El-Sheikh , Egypt.
Int J Phytoremediation. 2018 Apr 16;20(5):440-447. doi: 10.1080/15226514.2017.1365343.
The bioaccumulation and rhizofiltration potential of P. stratiotes for heavy metals were investigated to mitigate water pollution in the Egyptian wetlands. Plant and water samples were collected monthly through nine quadrats equally distributed along three sites at Al-Sero drain in Giza Province. The annual mean of the shoot biomass was 10 times that of the root. The concentrations of shoot heavy metals fell in the order: Fe < Mn < Cr < Pb < Cu < Zn < Ni < Co < Cd, while that of the roots were: Fe < Mn < Cr < Pb < Zn < Ni < Co < Cu < Cd. The bio-concentration factor (BCF) of most investigated heavy metals, except Cr and Pb, was greater than 1000, while the translocation factor (TF) of most investigated metals, except Pb and Cu, did not exceed one. The rhizofiltration potential (RP) of heavy metals was higher than 1000 for Fe, and 100 for Cr, Pb and Cu. Significant positive correlations between Fe and Cu in water with those in plant roots and leaves, respectively were recorded, which, in addition to the high BCF and RP, indicate the potential use of P. stratiotes in mitigating these toxic metals.
本研究旨在调查浮萍（P. stratiotes）对重金属的生物积累和根滤作用，以减轻埃及湿地的水污染。通过在吉萨省 Al-Sero 排水沟的三个地点沿 9 个四分体每月采集植物和水样。茎生物量的年平均值是根的 10 倍。茎中重金属的浓度依次为：Fe < Mn < Cr < Pb < Cu < Zn < Ni < Co < Cd，而根部则为：Fe < Mn < Cr < Pb < Zn < Ni < Co < Cu < Cd。除 Cr 和 Pb 外，大多数研究的重金属的生物浓缩系数（BCF）大于 1000，而大多数研究的金属的迁移系数（TF）除 Pb 和 Cu 外均未超过 1。对于 Fe，重金属的根滤作用（RP）高于 1000，对于 Cr、Pb 和 Cu，高于 100。在水中的 Fe 和 Cu 与植物根和叶中的相应元素之间记录到显著的正相关关系，除了高 BCF 和 RP 之外，这表明浮萍具有减轻这些有毒金属的潜力。
