Heavy metal contamination from mining sites in South Morocco: 2. Assessment of metal accumulation and toxicity in plants
Heavy metal contamination from mining sites in South Morocco: 2. Assessment of metal accumulation and toxicity in plants
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DOI：
10.1016/j.chemosphere.2005.07.076
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发表时间：
2006-05-01
期刊：
影响因子：
8.8
通讯作者：
Morel, Jean Louis
中科院分区：
文献类型：
--
作者：
Boularbah, Ali;Schwartz, Christophe;Morel, Jean Louis
在摩洛哥，含金属的土壤覆盖了相对较大的表面积，到目前为止，在这些采矿或工业场地上还没有发现超积累植物。这项工作的目的是评估在摩洛哥南部三个矿区发现的植物的金属积累程度，最终目标是通过使用MetPAD（TM）生物测试找到金属超积累物种。生物测试有助于获得有关植物水提取物的选择性金属毒性的信息。如生物试验所示，强金属毒性是超积累植物的指示。毒性测试与植物及其水提取物中金属的化学分析同时进行。化学分析允许测定超积累金属。主要生长在三个矿山及其附近的植物物种的标本与其相应的土壤取样。结果表明，尽管土壤中重金属含量相对较高，但所有植物的重金属含量和毒性均较低。我们的研究结果与用于分类超富集植物的标准的比较表明，我们从采矿点收集的植物是超耐受的，但不是hyperoxia。这一点通过转移因子通常低于1得到证实。然而，这些耐受性植物物种可用作重植被工具，以控制金属污染场地的侵蚀（植物稳定）。(c)2005爱思唯尔有限公司保留所有权利。
Metalliferous soils cover a relatively large surface area in Morocco, and up to now no hyperaccumulating plants have been identified on these mining or these industrial sites. The aim of this work was to assess the extent of metal accumulation by plants found in three mining areas in southern Morocco with the ultimate goal of finding metal hyperaccumulating species by using the MetPAD (TM) biotest. The biotest helps to obtain information on the selective metal toxicity of aqueous extracts from the plants. A strong metal toxicity, as revealed by the biotest is an indication of a hyperaccumulating plant. Toxicity tests were run concurrently with chemicals analyses of metals in plants and their water extracts. The chemical analyses allow the determination of the hyperaccumulated metal(s). Specimens of the plant species mainly growing on and in the vicinity of the three mines were sampled with their corresponding soils. The results show that all plants analyzed had lower heavy metal content and toxicity despite the relatively very high soil concentrations. A comparison of our results with the criterion used to classify the hyperaccumulator plants indicates that plants we collected from mining sites were hypertolerant but not hyperaccumulators. This was confirmed by transfer factors generally lower than 1. Nevertheless, these tolerant plants species can be used as tools for revegetation for erosion control in metals-contaminated sites (phytostabilization). (c) 2005 Elsevier Ltd. All rights reserved.