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Uptake of Cd from seawater by calcite

Published online by Cambridge University Press:  05 July 2018

J. Carneiro ,
H. Stoll  and
M. Prieto
J. Carneiro*
Affiliation:
Departamento de Geología, Universidad de Oviedo, C/ Jesús Arias de Velasco s/n, 33005 Oviedo, Spain
H. Stoll
Affiliation:
Departamento de Geología, Universidad de Oviedo, C/ Jesús Arias de Velasco s/n, 33005 Oviedo, Spain
M. Prieto
Affiliation:
Departamento de Geología, Universidad de Oviedo, C/ Jesús Arias de Velasco s/n, 33005 Oviedo, Spain
*
*E-mail: [email protected]
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Abstract

Experimental geochemical studies have shown the effectiveness of Cd removal from freshwaters by sorption onto calcite and aragonite. The strong affinity of Cd for these minerals suggests that a similar inorganic uptake could take place in the oceans. In this study, we have carried out sorption experiments by reacting calcite particles with Cd-enriched artificial seawater. Cadmium concentrations in solution were determined by ICP-AES. Salinity-normalized Cd concentrations showed an average net decrease of 30%. Depending on several factors, this inorganic uptake could influence the seawater concentrations of Cd in certain locations, and even contribute to a natural regulation of the concentration of this metal in the oceans.

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 389 - 392
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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