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Irreversibility of Se(VI)/Se(IV) Redox Couple in Synthetic Basaltic Ground Water at 25°C and 75°C

Published online by Cambridge University Press:  28 February 2011

Donald D. Runnells ,
Ralph D. Lindberg  and
John H. Kempton
Donald D. Runnells
Affiliation:
Department of Geological Sciences, University of Colorado, Boulder, CO 80309-0250
Ralph D. Lindberg
Affiliation:
Department of Geological Sciences, University of Colorado, Boulder, CO 80309-0250
John H. Kempton
Affiliation:
Department of Geological Sciences, University of Colorado, Boulder, CO 80309-0250
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Abstract

Synthetic basaltic ground water was spiked with different ratios of high-purity solium selenate and sodium selenite, to yield ratios of aqueous SeO42to SeO 42from 2100/1 to 1/44000, at temperatures of 25°C and 75°C. The apparent 2h of the solutions was measured by means of a platinum electrode. The time series Eh data were extrapolated to infinite time using the method of Muller [1,2]. Results show no relationship between the analyzed ratios of Se(VI)/Se(IV) in solution and the observed+Eh plues at the platinum electrode. In contrast, acidic solutions of Fe /Fe show nearly perfect Nernstian behavior and rapid electron transfer at the platinum electrode. Based on the results of this study, it is probably invalid to use Eh measurements as input to any equilibrium computer model for purposes of predicting the behavior of a pure selenium system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 723
Copyright
Copyright © Materials Research Society 1987

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