磷石膏
吸附
环境化学
化学
镉
修正案
石膏
环境修复
有机质
石灰
土壤水分
高岭石
土壤污染
矿物学
污染
土壤科学
吸附
环境科学
冶金
材料科学
原材料
生态学
有机化学
政治学
法学
生物
作者
V. Illera,Fernando Garrido,Susana Serrano,M. T. García‐González
标识
DOI:10.1046/j.1365-2389.2003.00583.x
摘要
Summary In situ stabilization of heavy metals in contaminated soils by the addition of various types of soil amendment is an attractive technique for remediation. We investigated the potential of three industrial by‐products (phosphogypsum, red gypsum and dolomitic residue) for boosting the heavy metal sorption capacity of an acid soil (patents pending, Spanish applications no 200201704 and 200201375) by using sorption isotherm experiments. The three by‐products were found substantially to increase the retention of lead, cadmium and copper on the solid components of the soil. The increase in lead retention of the soil horizons upon the addition of both phosphogypsum and red gypsum was dominated by the formation of anglesite minerals. The dolomitic residue increased the metal retention capacity of the soil horizons through the precipitation of laurionite‐type minerals as well as cadmium and copper hydroxy‐chlorides. In addition to the batch sorption study, we used scanning electron microscopy to investigate the metal sorption processes in the soil by the effect of the treatments. Lead was frequently found to be linked to the edge charges of kaolinite minerals. The three metals were found to be associated with organic matter in the Ap horizon treated with the three by‐products. Finally, the three metals were found to be associated with undissolved dolomitic residue particles.
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