Faculty of Health and Life Science, Inti International University, Nilai, Negeri Sembilan, Malaysia.
Institute of Biological Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Environ Sci Pollut Res Int. 2022 Mar;29(15):22069-22081. doi: 10.1007/s11356-021-17389-3. Epub 2021 Nov 13.
Metal remediation is important considering the environmental pressure due to soil pollution from landfill leachate. Hence, identifying potential plant-based option for remediation, especially the use of bio-/hyper-accumulators, is inevitable. Contamination of soil with heavy metals has been a decades-long concern. This study is therefore aimed to evaluating the metal-remediation potentials of four ornamental plant species-Cordyline fruticosa, Duranta variegated, Tradescantia spathacea, and Chlorophylum comosum-on leachate-contaminated soil. Details of the study involved leachate analysis, soil characterization, and metal-accumulation test on selected plants. Characterization of both landfill soil and leachate has indicated that Pb, Cu, As, Mn, Cr, Zn, Fe, and Ni were higher than the prescribed limits. The high metal reduction efficiency of C. fruticosa on all the studied metals was about 63%, 85%, 77.88%, 77.55%, and 75% for Pb, As, Mn, Zn, and Cr concentrations. The metal removal by the plants was significantly higher as compared to control soil (P < 0.05). The highest removal rate constant witnessed was for Mn (0.023 day) and was achieved using C. fruticosa. The results have revealed that C. fruticosa was the most promising plant for the removal of the studied metals. Therefore, it can be concluded that C. fruticosa has potentials to remediate heavy metal-contaminated soil at significant level. The findings will develop investigation into plant-tissue and compartmentalization effect on metal remediation using C. fruticosa.
考虑到垃圾渗滤液导致的土壤污染带来的环境压力，进行金属修复很重要。因此，寻找具有修复潜力的植物方法是必不可少的，尤其是利用生物/超积累植物。土壤重金属污染是一个长期存在的问题。因此，本研究旨在评估四种观赏植物（朱蕉、金叶假连翘、紫叶酢浆草和水蕴草）对渗滤液污染土壤的金属修复潜力。研究细节包括渗滤液分析、土壤特性分析和选定植物的金属积累试验。垃圾填埋场土壤和渗滤液的特性表明，Pb、Cu、As、Mn、Cr、Zn、Fe 和 Ni 的含量均高于规定限值。C. fruticosa 对所有研究金属的高金属还原效率约为 63%、85%、77.88%、77.55%和 75%，分别为 Pb、As、Mn、Zn 和 Cr 浓度。与对照土壤相比，植物对金属的去除率显著更高（P<0.05）。观察到的最高去除率常数是 Mn（0.023 天），这是使用 C. fruticosa 实现的。结果表明，C. fruticosa 是去除研究金属最有前途的植物。因此，可以得出结论，C. fruticosa 具有在显著水平上修复重金属污染土壤的潜力。研究结果将进一步调查 C. fruticosa 对植物组织和金属修复的分区效应。
