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首页> 外文期刊>Pedosphere: A Quarterly Journal of Soil Science >Attenuation of metal bioavailability in acidic multi-Metal contaminated soil treated with fly ash and steel slag. (Special Issue: Bioremediation of contaminated soil and water.)
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Attenuation of metal bioavailability in acidic multi-Metal contaminated soil treated with fly ash and steel slag. (Special Issue: Bioremediation of contaminated soil and water.)

机译：用粉煤灰和钢渣处理的酸性多金属污染土壤中金属的生物利用度降低。 （特刊：受污染的土壤和水的生物修复。）

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摘要

A pot experiment was conducted with multi-metal (Pb, Cd, Cu, and Zn) contaminated acidic soil to investigate changes in available metal burden resulting from the application of industrial wastes (fly ash and steel slag). The efficiency of amendments-induced metal stabilization was evaluated by diffusive gradients in thin films (DGT), sequential extraction, and plant uptake. The stability of remediation was assessed by an acidification test and by chemical equilibrium modeling. Addition of fly ash (20 g kg-1) and steel slag (3 g kg-1) resulted in similar increase in soil pH. Both amendments significantly decreased the concentrations of metals measured with DGT (CDGT) and the metal uptake by Oryza sativa L. Significant correlations were found between CDGT and the concentration of a combination of metal fractions (exchangeable, bound to carbonates, and bound to Fe/Mn oxides), unraveling the labile species that participate in the flux of metal resupply. The capability of metal resupply, as reflected by the R (ratio of CDGT to pore water metal concentration) values, significantly decreased in the amended soils. The CDGT correlated well with the plant uptake, suggesting that DGT is a good indicator for bioavailability. Acidification raised the extractable metal concentration in amended soil but the concentration did not return to the pre-amendment level. Equilibrium modeling indicated that the soil amendments induced the precipitation of several Fe, Al and Ca minerals, which may play a positive role in metal stabilization. Chemical stabilization with alkaline amendments could be an effective and stable soil remediation strategy for attenuating metal bioavailability and reducing plant metal uptake.CAS Registry Numbers 7440-43-9 7440-50-8 7440-66-6 7439-89-6 7439-96-5 7439-92-1
机译：用多金属（Pb，Cd，Cu和Zn）污染的酸性土壤进行了盆栽试验，以研究由于施用工业废物（粉煤灰和钢渣）而导致的可用金属负荷的变化。修正剂诱导的金属稳定作用的效率通过薄膜中的扩散梯度（DGT），顺序提取和植物吸收来评估。通过酸化测试和化学平衡模型评估修复的稳定性。加入粉煤灰（20 g kg -1 ）和钢渣（3 g kg -1 ）导致土壤pH值也有类似的增加。两种修正均显着降低了DGT（C DGT ）测得的金属浓度和水稻（Oryza sativa L）的金属吸收。C DGT 与a的浓度之间存在显着相关性。金属馏分的组合（可交换，与碳酸盐结合并与Fe / Mn氧化物结合），破坏了参与金属再供应通量的不稳定物质。在修正土壤中，R（C 与孔隙水金属浓度的比）值反映了金属的补给能力。 C DGT 与植物的吸收密切相关，表明DGT是生物利用度的良好指标。酸化提高了改良土壤中可提取金属的浓度，但浓度未恢复到修正前的水平。平衡模型表明，土壤改良剂诱导了几种Fe，Al和Ca矿物的沉淀，这可能对金属稳定起积极作用。用碱改良剂进行化学稳定化处理可能是一种有效且稳定的土壤修复策略，可降低金属的生物利用度并减少植物对金属的吸收.CAS注册号7440-43-9 7440-50-8 7440-66-6 7439-89-6 7439-96 -5 7439-92-1

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