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Deployment and Retrieval of Mineral Samplers

Deployment and Retrieval of Mineral Samplers

Published on: January 20, 2026

Chromium and nickel migration study through fine grained soil.

Sunil Kumar¹, Sudipta Ghosh, Somnath Mukherjee

¹Council of Scientific and Industrial Research (CSIR), National Environmental Engineering Research Institute (NEERI), Kolkata Zonal Laboratory, Kolkata 700107, India. s_kumar@neeri.res.in

Journal of Hazardous Materials

|June 12, 2009

Summary

This study shows that local clay effectively removes toxic heavy metals, chromium-6 (Cr6+) and nickel-2 (Ni2+), from contaminated soil and water near power plants. The clay demonstrates significant potential for environmental remediation of these pollutants.

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Area of Science:

Environmental Science
Geochemistry
Soil Science

Background:

Ash pond sites of Super Thermal Power Plants can contaminate surrounding soil and water with toxic heavy metals.
Chromium-6 (Cr6+) and Nickel-2 (Ni2+) were found in excess of permissible limits at a West Bengal, India ash pond site.

Purpose of the Study:

To investigate the toxic metal attenuation capacity of a field clay sample from a Super Thermal Power Plant ash pond vicinity.
To evaluate the adsorption behavior and capacity of the clay for Cr6+ and Ni2+.

Main Methods:

Laboratory-scale batch kinetic experiments were conducted.
Adsorption isotherms (Freundlich) and breakthrough studies were performed.
Analysis of metal sorption in vertical and horizontal soil directions.

Main Results:

The clay sample exhibited significant uptake capacity for both Cr6+ and Ni2+ under equilibrium conditions.
Experimental data fitted well with the Freundlich isotherm model, indicating chemisorption.
Over 80% of Ni2+ and 72% of Cr6+ were sorbed by the soil, demonstrating good metal adsorption capacity.

Conclusions:

The investigated field clay possesses a notable capacity for attenuating toxic Cr6+ and Ni2+.
The clay shows promise as a cost-effective and sustainable material for the remediation of heavy metal-contaminated sites.