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Iron-rich saponite: dissolution reactions and Cr uptake

Published online by Cambridge University Press:  09 July 2018

M. F. Brigatti ,
C. Lugli ,
L. Poppi  and
G. Venturelli
M. F. Brigatti
Affiliation:
Department of Earth Sciences, University of Modena, via S. Eufemia 19, I-41100 Modena
C. Lugli
Affiliation:
Department of Earth Sciences, University of Modena, via S. Eufemia 19, I-41100 Modena
L. Poppi
Affiliation:
Department of Earth Sciences, University of Modena, via S. Eufemia 19, I-41100 Modena
G. Venturelli
Affiliation:
Department of Earth Sciences, University of Parma, Parma, Italy
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Abstract

To gain a deeper understanding of the geochemical processes involved in the interactions between ionic solutions and clay minerals in natural systems, the dissolution rate of an Fe-rich saponite from Mt. Prinzera (Taro Valley, Italy) was measured as a function of pH and time at 25°C. Also, its ability to adsorb Cr was studied at varying metal concentrations (3.22, 5.50, 8.50 mEq l-1) and with different competing anions (CH3COO-, Cl-, NO3-). It was found that there is a correlation between the experimentally determined release rate constant (k), as defined by the relase of Si, and pH. In acidic solutions, the k values correlate negatively with pH, whereas the opposite occurs for basic solutions. The extent of Cr uptake was measured by analysis of the liquid portion separated by centrifugation after a controlled period of exposure. The Cr adsorbed for different concentrations and anionic environments shows the dependence of Cr uptake on the initial metal concentration and on accompanying anions in the order CH3COO-, Cl-, NO3-.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 4 , December 1999 , pp. 637 - 645
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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