Abstract
This study was performed on 21 soils with the aim of establishing whether Pb and Ni adsorption/desorption parameters could be considered as good indicators of the risk of groundwater pollution. Results showed that high pH values in soil caused a totally irreversible Pb adsorption, thus excluding any risk of Pb groundwater pollution. Sorption/desorption studies, quantified by the desorption index (DI), showed that Ni retention was only partly affected by the basic pH values but it was also due to the electrostatic attraction processes occurring on soil surfaces, as demonstrated by the partial reversibility of the Ni sorbed. This justifies possible risks of Ni groundwater pollution. The results of a monitoring research confirmed these findings. Results suggested that the adsorption/desorption parameters, namely DI, are promising indicators to predict the risk of groundwater pollution from metals in calcareous soils.
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This study was performed with the financial support of Ministry of Universities and Scientific and Technological Research (MIUR), PRIN 2005 “Heavy metal speciation to find indicators of urban soil degradation.”
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Businelli, D., Massaccesi, L. & Onofri, A. Evaluation of Pb and Ni Mobility to Groundwater in Calcareous Urban Soils of Ancona, Italy. Water Air Soil Pollut 201, 185–193 (2009). https://doi.org/10.1007/s11270-008-9936-0
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DOI: https://doi.org/10.1007/s11270-008-9936-0