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首页> 外文期刊>International Journal of Environmental Research and Public Health >Evaluation of Mobility, Bioavailability and Toxicity of Pb and Cd in Contaminated Soil Using TCLP, BCR and Earthworms
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Evaluation of Mobility, Bioavailability and Toxicity of Pb and Cd in Contaminated Soil Using TCLP, BCR and Earthworms

机译：用TCLP，BCR和Earth评价污染土壤中铅和镉的迁移率，生物利用度和毒性

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摘要

The objective of the present study was to investigate the reduction of mobility, availability and toxicity found in soil contaminated with lead (Pb) and cadmium (Cd) from Santo Amaro Municipality, Bahia, Brazil using two combined methods, commonly tested separately according to the literature: metal mobilization with phosphates and phytoextraction. The strategy applied was the treatment with two sources of phosphates (separately and mixed) followed by phytoremediation with vetiver grass (Vetiveria zizanioides (L.)). The treatments applied (in triplicates) were: T1—potassium dihydrogen phosphate (KH2PO4); T2—reactive natural phosphate fertilizer (NRP) and; T3—a mixture 1:1 of KH2PO4 and NRP. After this step, untreated and treated soils were planted with vetiver grass. The extraction procedures and assays applied to contaminated soil before and after the treatments included metal mobility test (TCLP); sequential extraction with BCR method; toxicity assays with Eisenia andrei. The soil-to-plant transfer factors (TF) for Pb and Cd were estimated in all cases. All treatments with phosphates followed by phytoremediation reduced the mobility and availability of Pb and Cd, being KH2PO4 (T1) plus phytoremediation the most effective one. Soil toxicity however, remained high after all treatments.
机译：本研究的目的是使用两种组合方法研究巴西巴伊亚州Santo Amaro市被铅（Pb）和镉（Cd）污染的土壤中的迁移率，有效性和毒性的降低，这两种方法通常根据文献：金属动员磷酸盐和植物提取。采用的策略是用两种磷酸盐源（分别和混合）处理，然后用香根草（Vetiveria zizanioides（L.））进行植物修复。应用的处理（一式三份）：T1-磷酸二氢钾（KH2PO4）; T2-活性天然磷酸盐肥料（NRP）和; T3-KH2PO4和NRP的1：1混合物。在此步骤之后，将未处理和处理过的土壤种植香根草。处理之前和之后应用于污染土壤的提取程序和测定方法包括金属迁移率测试（TCLP）;用BCR方法顺序提取; Eisenia andrei的毒性试验。在所有情况下都估算了铅和镉的土壤-植物转移因子（TF）。所有用磷酸盐处理然后进行植物修复的处理都会降低Pb和Cd的迁移率和利用率，其中最有效的方法是KH2PO4（T1）加植物修复。然而，在所有处理之后，土壤毒性仍然很高。

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