Environmental Geology

, Volume 47, Issue 8, pp 1162–1170

Sorption behavior of heavy metal pollutants onto shales and correlation with shale geochemistry

Original Article


The sorption of lead (II) and cadmium (II) on seven shales belonging to the Proterozoic Vindhyan basin, central India, and a black cotton soil, Mumbai, India, was studied and compared with sorbent geochemistry. The sorption equilibrium studies were conducted under completely mixed conditions in batch reactors (pH=5.0 and ionic strength= 0.01 M) at room temperature. The Freundlich model provided better fits to the experimental data compared to Langmuir model. High cadmium and lead sorption was observed for the calcareous shales with greater than 5% CaCO3. The Freundlich isotherm parameter relating to sorption capacity, i.e., KF, yielded a strong correlation with the calcium carbonate and calcium oxide content across the various geosorbents studied. The observed sorption pattern may be attributed to complex formation of CaCO3 with Pb2+ and Cd2+ leading to surface precipitation. Moreover, the Ca2+ present in the sorbents may also involve in ion exchange reaction with lead and cadmium.


Adsorption Lead Cadmium Calcium carbonate Calcium oxide Heavy metals India Shale 


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Department of Earth SciencesIIT BombayMumbaiIndia
  2. 2.Center for Environmental Science and EngineeringMumbaiIndia

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