Effects of two chelating agents (EDTA and DTPA) on the autochthonous vegetation of a soil polluted with Cu, Zn and Cd.
Effects of two chelating agents (EDTA and DTPA) on the autochthonous vegetation of a soil polluted with Cu, Zn and Cd.
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DOI：
10.1016/j.scitotenv.2007.01.022
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发表时间：
2007-05
期刊：
影响因子：
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通讯作者：
J. Pastor;Alberto Aparicio;Antonio Gutierrez-Maroto;A. Hernández
中科院分区：
文献类型：
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作者：
J. Pastor;Alberto Aparicio;Antonio Gutierrez-Maroto;A. Hernández
螯合剂被认为是修复具有足够有机质的金属污染土壤的有用物质，但这些物质对土壤中的植物或植物群落种子库的影响相对未知。在这项工作中，比较了两种螯合物质(EDTA和DTPA)对受废弃铜矿“Fernandito”(Garganta de los Montes，马德里)影响的湿地植物群落的影响。利用含有草原种子库的土壤表层设计了一个微型生物测试(6个月)。该土壤铜污染水平较高，锌、镉含量显著(分别为1120、190和15ppm)，pH为5，有机质含量为6.2%。土壤经过三种不同的处理：a)未处理的土壤(对照)，b)添加1微克/千克EDTA，或c)1微克/千克DTPA。本文给出的结果与植物盖度、物种丰富度、地上和地下生物量以及最丰富的植物的化学成分有关。EDTA和DTPA都没有对植株产生强烈的负面影响，而是显着增加了地上部分和根中铜的积累量。特别是，当种植在添加EDTA的土壤中时，虽然它们表现出一些营养失衡(较低的磷含量)，但它们提取了大量的铜。相比之下，在DTPA改良土壤中生长的植物中检测到较低的金属浓度。
Chelating agents are thought to be useful for the remediation of metal-polluted soils with adequate organic matter, but the effects of these substances on the plants or seed bank of plant communities that occur in the soils are relatively unknown. In this work, the effects of two chelating substances (EDTA and DTPA) on a wet grassland plant community affected by the presence of the abandoned copper mine “Fernandito” (Garganta de los Montes, Madrid) were compared. A microcosm bioassay (6 months) was designed using the soil's top layer containing the grassland's seed bank. This soil showed a high Cu pollution level, significant contents of Zn and Cd (1120, 190, and 15 ppm, respectively), a pH of 5 and an OM content of 6.2%. The soil was subjected to three different treatments: a) untreated soil (control), b) the addition of 1 g/kg EDTA, or of c) 1 g/kg DTPA. The results presented here are those related to the plant cover, species richness, aboveground and subterranean biomass and chemical composition of the most abundant plants. Neither EDTA nor DTPA caused intense negative effects on the plants rather they significantly increased the amount of copper accumulated in aboveground parts and roots. In particular, Agrostis castellana and Corrigiola telephiifolia extracted high amounts of copper when grown in the soil with added EDTA, although they showed some nutritional imbalances (lower P contents). In contrast, lower metal concentrations were detected in plants grown in the DTPA amended soil.