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Assessment of selected sequential extraction and the toxicity characteristic leaching test as indices of metal mobility in serpentinite soils

机译：蛇毒蛇毒土壤中选择的连续萃取和毒性特征浸出试验作为金属迁移率指标的评估

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Serpentinite soils are characterised by high concentrations of chromium, nickel, and cobalt. The accumulation of heavy metals as non-degradable inorganic contaminants is of great concern. Under normal circumstances the form in which a metal exists governs its transport in the environment and thus, its hazards. In this study, a specific developed speciation analysis for tropical soils was applied to determine the mobility of Cr, Ni and Co in two serpentinitic soil outcrops in Malaysia. The combination of selective sequential extraction analysis (SEE) and X-ray diffraction of soil powders showed that Cr and Ni are primarily associated with the residual fraction of soil which is inherited from resistant silicates. The crystalline Fe-oxide fraction of soil is the second substanial scavenger of Cr and Ni, whilst the dynamics of Co are mostly controlled by Mn-oxide and the poor crystalline Fe-oxide. The more easily mobilised forms of the studied metals carried on soluble-exchangeable, surface adsorbed and organic matter fractions are of minimal compartments. Therefore these metals are basically not available in the environment. On the other hand, corroborating information on the mobility of the metals was gained by applying the toxicity characteristic leaching procedure test (TCLP). The consistent results of the TCLP with the SSE revealed the non-toxic effects of Cr, Ni and Co in the environment despite their overload accumulation in the analysed serpentinite soils.
机译：蛇纹岩土壤的特征是高浓度的铬，镍和钴。重金属作为不可降解的无机污染物的积累非常令人关注。在正常情况下，金属的存在形式决定着其在环境中的运输，从而决定了其危害。在这项研究中，对马来西亚热带土壤进行了专门开发的形态分析，以确定Cr，Ni和Co在两个蛇形土壤露头中的迁移率。选择性顺序萃取分析（SEE）和土壤粉末的X射线衍射相结合表明，Cr和Ni主要与土壤中的残留部分有关，而残留部分是由耐性硅酸盐继承而来的。土壤中的结晶性Fe-氧化物是Cr和Ni的第二大清除剂，而Co的动力学主要受Mn-氧化物和不良的结晶性Fe-氧化物控制。携带在可溶交换，表面吸附和有机物组分上的被研究金属的更容易动员的形式具有最小的间隔。因此，这些金属在环境中基本上不可用。另一方面，通过应用毒性特征浸出程序试验（TCLP）获得了有关金属迁移率的确证信息。 TCLP与SSE的一致结果表明，尽管在分析的蛇纹岩土壤中积累了过量的Cr，Ni和Co，但它们对环境无毒。

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