Munyengabe Alexis, Kamogelo Ledwaba Samuel, Ngmenzuma Titus Yeliku-Ang, Banda Maria Fezile
Department of Chemistry, Faculty of Science, Arcadia Campus, Tshwane University of Technology, Pretoria 0183, South Africa.
Department of Crop Sciences, Faculty of Science, Arcadia Campus, Tshwane University of Technology, Pretoria 0183, South Africa.
Plants (Basel). 2024 Sep 11;13(18):2551. doi: 10.3390/plants13182551.
The disposal of coal fly ash (CFA) generated from coal-fired power stations has serious impact on the ecosystem, by converting large pieces of land to barren ash dams with the potential to contaminate groundwater, surface water, air and soil. The aim of this study was to clarify the potential of phytoremediation using (Thunb.) Less. in areas polluted by CFA through conduction of pot trial experiments for 14 weeks. Plants of the same age were cultivated in CFA to assess their growth, photosynthetic rate and tolerance towards metal toxicity. This study revealed that the CFA was moderately polluted with heavy metals, and a lower photosynthetic rate was recorded for the CFA plants in comparison to the controls (plants grown in soil). Although the CO assimilation rate was lower for the CFA plants, increased growth was recorded for all the plants tested. Inductively coupled plasma mass spectrometry (ICP-MS) was used to quantify the amount of trace elements in samples and parameters including translocation factor (TF) and bioconcentration factor (BCF) were used to evaluate the phytoremediation potential of (Thunb.) Less. The results revealed that higher concentrations of Cd, Co, Cr, Cu, Mn and Pb were accumulated in the roots, while As, Ni and Zn were found in the shoots. Elements including As, Cr and Zn reported TF values above 1, indicating the plants' phytoextraction potential. The BCF values for As, Cu and Zn were 1.22, 1.19 and 1.03, indicating effectiveness in the phytostabilization processes. A removal rate efficiency ranging from 18.0 to 56.7% was recorded confirming that, (Thunb.) Less. can be employed for restoration of CFA dams.
燃煤发电站产生的粉煤灰（CFA）处置对生态系统有严重影响，它会使大片土地变成贫瘠的灰坝，有可能污染地下水、地表水、空气和土壤。本研究的目的是通过进行为期14周的盆栽试验，阐明在受CFA污染的地区使用海州香薷进行植物修复的潜力。将同龄植物种植在CFA中，以评估它们的生长、光合速率和对金属毒性的耐受性。本研究表明，CFA受到重金属的中度污染，与对照（种植在土壤中的植物）相比，CFA植物的光合速率较低。虽然CFA植物的CO同化率较低，但所有测试植物的生长都有所增加。使用电感耦合等离子体质谱（ICP-MS）对样品中的微量元素含量进行定量，并使用包括转运系数（TF）和生物富集系数（BCF）在内的参数来评估海州香薷的植物修复潜力。结果表明，较高浓度的Cd、Co、Cr、Cu、Mn和Pb积累在根部，而As、Ni和Zn则在地上部分被发现。包括As、Cr和Zn在内的元素的TF值高于1，表明植物具有植物提取潜力。As、Cu和Zn的BCF值分别为1.22、1.19和1.03，表明在植物稳定过程中有效。记录的去除率效率在18.0%至56.7%之间，证实海州香薷可用于修复CFA灰坝。
