Organic matter amendments are applied to contaminated soil to provide a better habitat for re-vegetation and remediation, and olive mill waste compost (OMWC) has been described as a promising material for this aim. We report here the results of an incubation experiment carried out in flooded conditions to study its influence in As and metal solubility in a trace elements contaminated soil. NPK fertilisation and especially organic amendment application resulted in increased As, Se and Cu concentrations in pore water. Independent of the amendment, dimethylarsenic acid (DMA) was the most abundant As species in solution. The application of OMWC increased pore water dissolved organic-carbon (DOC) concentrations, which may explain the observed mobilisation of As, Cu and Se; phosphate added in NPK could also be in part responsible of the mobilisation caused in As. Therefore, the application of soil amendments in mine soils may be particularly problematic in flooded systems.

译文

:有机物改良剂用于受污染的土壤,以提供更好的生境和植被修复环境,橄榄磨碎料(OMWC)被描述为实现这一目标的有前途的材料。我们在此报告在淹没条件下进行的孵化实验的结果,以研究其在微量元素污染土壤中的砷和金属溶解度的影响。氮磷钾施肥,尤其是有机改良剂的施用导致孔隙水中砷,硒和铜的浓度增加。独立于修订案,二甲基砷酸(DMA)是溶液中最丰富的As物种。 OMWC的应用增加了孔隙水溶解有机碳(DOC)的浓度,这可以解释观察到的As,Cu和Se的迁移。氮磷钾中添加的磷酸也可能部分负责砷中的动员。因此,在水淹系统中,在土壤中使用土壤改良剂可能特别成问题。

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