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首页> 外文期刊>Waste management & research >Metal fractionation in soil profiles at automobile mechanic waste dumps
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Metal fractionation in soil profiles at automobile mechanic waste dumps

机译：汽车修理工垃圾场土壤剖面中的金属分馏

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Soil profiles at five automobile mechanic waste dumps in Port-Harcourt, Nigeria were investigated to assess the spatial distribution, chemical speciation, and likely mobility of Cd, Cu, Pb, Zn, Cr and Ni in the soil as a function of the soil properties. A sequential fractionation protocol was used that generated six different fractions into which soil metal could partition. Cadmium was associated with non-residual fractions at surface horizons, but at lower depths it was in the residual fractions. Copper and Cr partitioned into organic and residual fractions, while Pb was associated with an Fe-Mn oxide fraction and the residual fractions. Zinc in surface horizons partitioned into an Fe-Mn oxide fraction and a fraction that captured carbonate-bound species, but in subsurface horizons, it was mainly in the residual fractions. Ni was predominantly found in the residual fractions. Mobility factors were calculated, and their values tended to decrease with increasing profile depth, indicating that these metals are relatively mobile in the surface horizons compared the subsurface except for chromium in the 15-30 cm depths. The mobility factors for the heavy metals follow the order: Cd > Zn > Pb > Cu > Cr > Ni. The results suggest that there is serious contamination hazard with Cd, Pb, and Zn in the soil profiles.
机译：调查了尼日利亚哈科特港五个汽车修理厂垃圾场的土壤剖面，以评估土壤中Cd，Cu，Pb，Zn，Cr和Ni的空间分布，化学形态以及可能的迁移率随土壤特性的变化。使用了顺序分馏方案，该方案产生了土壤金属可以分配到的六个不同组分。镉在地表水平上与非残留馏分有关，但在较低深度处，它在残留馏分中。铜和铬分为有机部分和残余部分，而铅则与铁锰氧化物部分和残余部分有关。地表层中的锌分为Fe-Mn氧化物级分和捕获碳酸盐结合物种的级分，但在地下地层中，锌主要存在于残余级分中。 Ni主要存在于残留部分中。计算出流动因子，其值随轮廓深度的增加而趋于减小，这表明这些金属在表面层中相对可移动，与15-30 cm深度的铬相比，其次表层为低。重金属的迁移率因子顺序为：Cd> Zn> Pb> Cu> Cr> Ni。结果表明，土壤剖面中镉，铅和锌存在严重的污染危害。

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