期刊
CHEMOSPHERE
卷 131, 期 -, 页码 78-84出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2015.02.034
关键词
Sequential extraction procedure; Heavy metal; Lead; Buffering capacity; Kinetic limitations
资金
- Spanish Ministry of Innovation
- FEDER fund of the EU through the Research Project ERHMES [CTM2010-16824]
- UE project Electroacross [IRSES-GA-2010 269289]
- Spanish Ministry of Education, Culture and Sport
Understanding the possible pH-buffering processes is of maximum importance for risk assessment and remediation feasibility studies of heavy-metal contaminated soils. This paper presents the results about the effect of the buffering capacity of a polluted soil, rich in carbonates, on the pH and on the leaching evolution of its main contaminant (lead) when a weak acid (acetic acid) or a strong one (nitric acid) are slowly added. In both cases, the behavior of lead dissolution could be predicted using available (scientifically verified freeware) models assuming equilibrium between the solid and the aqueous phase. However, the experimental results indicate that the dissolution of calcium and magnesium carbonates is kinetically controlled. These kinetic limitations affect the overall behavior, and should be considered to understand also the response of the metals under local equilibrium. The well-known BCR sequential extraction procedure was used before- and after-treatment, to fractionate the lead concentration in the soil according to its mobility. The BCR results were also in agreement with the predictions of the equilibrium model. This agreement allows new insights about the information that could be derived from the BCR fractionation analysis. (C) 2015 Elsevier Ltd. All rights reserved.
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