Department of Theoretical and Applied Biology, Faculty of Biosciences, College of Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
Department of Theoretical and Applied Biology, Faculty of Biosciences, College of Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
Ecotoxicol Environ Saf. 2018 Feb;148:97-104. doi: 10.1016/j.ecoenv.2017.10.014. Epub 2017 Nov 6.
Chemically assisted phytoremediation is fast gaining attention as a biotechnology to accelerate heavy metal removal from contaminated substrates, but how different chemical amendments affect the process remains an important research question. Here, bioaccumulation factor (BAF), translocation factor (TF), removal efficiency (RE) and uptake of Hg, As, Pb, Cu and Zn by cattail (Typha latifolia) and vetiver (Chrysopogon zizanioides) were quantified in a potted experiment to determine the effects of amendments on the phytoremediation success. Baseline concentrations of heavy metals within the studied mined site were determined. The experiment involved three soil treatments (each comprising 16 samples amended with 0.05mol/L ethylene di-aminetetraacetic acid (EDTA), 3g of aluminum sulfate [Al(SO)], and unamended control) transplanted with equal numbers of vetiver and cattail. Growth performance (height) of plant species was monitored every two weeks. Sixteen weeks after transplanting, heavy metal levels in plant and soil samples were quantified following standard protocols, and the biomass and root length measured for each plant species. Results indicated strong negative impact of mining activities on heavy metal levels of soil in the study area. Soil amendment considerably enhanced the BAF, TF, RE and uptake but the effect varied with plant species and heavy metal in question. The amendment also stimulated strong positive correlation between RE and BAF, TF and metal uptake, and generally did not show any negative effects on plant growth performance. In general, soil amendment aided the accumulation and translocation of heavy metals in the plant species studied, and could be explored for cleaning up contaminated sites.
化学辅助植物修复作为一种生物技术，正在快速受到关注，以加速从受污染基质中去除重金属，但不同的化学改良剂如何影响这一过程仍然是一个重要的研究问题。在这里，采用盆栽实验定量研究了水烛（Typha latifolia）和香根草（Chrysopogon zizanioides）对 Hg、As、Pb、Cu 和 Zn 的生物积累因子（BAF）、转移因子（TF）、去除效率（RE）和吸收，以确定改良剂对植物修复成功的影响。测定了研究矿区重金属的基线浓度。实验涉及三种土壤处理（每个处理由 16 个样本组成，分别用 0.05mol/L 乙二胺四乙酸（EDTA）、3g 硫酸铝[Al(SO)]和未改良的对照进行改良），移植了等量的香根草和水烛。每隔两周监测一次植物物种的生长性能（高度）。移植后 16 周，按照标准方案对植物和土壤样本中的重金属含量进行定量，并测量每种植物的生物量和根长。结果表明，采矿活动对研究区域土壤重金属水平有强烈的负面影响。土壤改良剂显著提高了 BAF、TF、RE 和重金属的吸收，但效果因植物物种和重金属种类而异。改良剂还刺激了 RE 和 BAF、TF 和金属吸收之间的强烈正相关，并且通常对植物生长性能没有任何负面影响。总的来说，土壤改良剂促进了研究植物物种中重金属的积累和转运，可以探索用于清理污染场地。
