Chehregani Abdolkarim, Noori Mitra, Yazdi Hossein Lari
Department of Biology, Laboratory of Plant Cell Developmental Biology, Bu-Ali Sina University, Hamedan, Iran.
Ecotoxicol Environ Saf. 2009 Jul;72(5):1349-53. doi: 10.1016/j.ecoenv.2009.02.012. Epub 2009 Apr 21.
Heavy metal pollution is a worldwide problem. Phytoremediation is an effective and low-cost interesting technology. This study was conducted in a dried waste pool of a lead and zinc mine in Angouran (Iran) to find accumulator plant(s). Concentrations of heavy metals were determined both in the soil and the plants that were grown in the mine and out of mine. The concentration of total Cu, Fe, Zn, Pb and Ni in the mine area were higher than the control soil. The results showed that five dominant vegetations namely Amaranthus retroflexus, Polygonum aviculare, Gundelia tournefortii, Noea mucronata and Scariola orientalis accumulated heavy metals. Based on the results, it was concluded that N. mucronata is the best accumulator for Pb, Zn, Cu, Cd and Ni, but the best Fe accumulator is A. retroflexus. Phytoremediation ability of N. mucronata was evaluated in experimental pots. The study showed that the amounts of heavy metals were decreased in polluted soils during experiments. The accumulation of metals in the root, leave and shoot portions of N. mucronata varied significantly but all the concentrations were more than natural soils. The results indicated that N. mucronata is an effective accumulator plant for phytoremediation of heavy-metals-polluted soils.
重金属污染是一个全球性问题。植物修复是一项有效且低成本的有趣技术。本研究在伊朗安古兰一个铅锌矿的干涸废池中进行，以寻找富集植物。测定了矿山内和矿山外种植的土壤及植物中的重金属浓度。矿区土壤中铜、铁、锌、铅和镍的总浓度高于对照土壤。结果表明，反枝苋、扁蓄、刺菜蓟、具刺假蓬和东方苣荬菜这五种优势植被积累了重金属。基于这些结果得出结论，具刺假蓬是铅、锌、铜、镉和镍的最佳富集植物，但最佳铁富集植物是反枝苋。在实验盆中评估了具刺假蓬的植物修复能力。研究表明，实验期间污染土壤中的重金属含量有所下降。具刺假蓬根、叶和茎部分的金属积累差异显著，但所有浓度均高于天然土壤。结果表明，具刺假蓬是一种用于修复重金属污染土壤的有效富集植物。
