Reduction of selenite by cysteine in ionic media

Francesca Gennari, Virender K. Sharma, Maurizio Pettine, Luigi Campanella, Frank J. Millero

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Abstract

This paper focuses on the abiotic reduction of selenite (Se(IV)) by cysteine (Cys, NH3+CH(CH2SH)COOH), which is a representative thiol produced by aquatic organism under oxidative stress. The rates of reduction of Se(IV) by cysteine were measured in deaerated NaCl solutions and natural waters as a function of pH (4.0-9.0), temperature (10-40°C), and ionic strength (0.01-1.0M). The rates showed a complex dependence on pH with similar values from pH 4.0-5.0, increasing values from pH 5.0-7.0 and then decreasing values at pH higher than 7.0. An apparent energy of activation obtained was 31±6kJmol-1, which was independent of ionic strength.

Original languageEnglish (US)
Pages (from-to)98-108
Number of pages11
JournalGeochimica et Cosmochimica Acta
Volume124
DOIs
StatePublished - Jan 1 2014

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ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Gennari, F., Sharma, V. K., Pettine, M., Campanella, L., & Millero, F. J. (2014). Reduction of selenite by cysteine in ionic media. Geochimica et Cosmochimica Acta, 124, 98-108. https://doi.org/10.1016/j.gca.2013.09.019