a School of Mechanical and Industrial Engineering, Ethiopian Institute of Technology, Mekelle University , Mekelle , Ethiopia.
b Ethiopian Environment and Forest Research Institute , Addis Ababa , Ethiopia.
Int J Phytoremediation. 2018 Aug 24;20(10):965-972. doi: 10.1080/15226514.2017.1365333.
This study investigated the concurrent accumulation of eight heavy metals by two floating aquatic macrophytes (Lemna minor and Azolla filiculoides) cultivated in ambient media and blended wastewaters in the semiarid regions of Ethiopia. Both species accumulated heavy metals in varying degrees with a significant concentration gradient within the immediate water media. Highest bioconcentration factor (BCF) was determined for Mn and Fe in both plants. Results revealed that L. minor was high phytoaccumulator for Fe, Mn, Zn, and Co but moderate for Cd, Cu, Ni, and Cr. On the other hand, A. filiculoides was a high accumulator for Fe, Mn, Zn, and Cu, but its potency was moderate for Co, Cr, and Ni, but lower for Cd. Both species exhibited significant difference in accumulating Co, Zn, and Mn (p < 0.05). In general, the BCFs for both plants were comparable within the same treatment. In this study, stronger associations between the heavy metal concentrations in the plant tissues and in the grown water media were observed for A. filiculoides.
本研究调查了两种漂浮水生植物（浮萍和满江红）在埃塞俄比亚半干旱地区的环境介质和混合废水中同时积累八种重金属的情况。两种物种都不同程度地积累了重金属，在直接水介质中有明显的浓度梯度。在两种植物中，Mn 和 Fe 的生物浓缩系数（BCF）最高。结果表明，浮萍对 Fe、Mn、Zn 和 Co 的积累量较高，对 Cd、Cu、Ni 和 Cr 的积累量中等；另一方面，满江红对 Fe、Mn、Zn 和 Cu 的积累量较高，但对 Co、Cr 和 Ni 的积累量中等，对 Cd 的积累量较低。两种物种在积累 Co、Zn 和 Mn 方面存在显著差异（p < 0.05）。一般来说，两种植物在相同处理下的 BCF 相当。在这项研究中，观察到满江红植物组织和生长水中重金属浓度之间存在更强的关联。
