Effects of Cinnabar on Pyrite Oxidation by Thiobacillus ferrooxidans and Cinnabar Mobilization by a Mercury-Resistant Strain

Author:

Baldi Franco1,Olson Gregory J.1

Affiliation:

1. Department of Environmental Biology, University of Siena, I 53100 Siena, Italy, and Surface Chemistry and Bioprocesses Group, National Bureau of Standards, Gaithersburg, Maryland 208992

Abstract

The effect of cinnabar on pyrite oxidation by mercury-sensitive and mercury-resistant strains of Thiobacillus ferrooxidans was investigated by using percolation columns. Mercury-resistant strains oxidized pyrite in pyrite-cinnabar mixtures (1 and 10%, wt/wt), whereas a mercury-sensitive strain did not. Elemental mercury was produced by the mercury-resistant strains growing in the pyrite-cinnabar mixtures in percolation columns and in flasks containing cinnabar only. Manometric experiments showed that cinnabar had little effect on oxygen uptake of mercury-sensitive or mercury-resistant cells growing on ferrous sulfate, pyrite, or pyrite-ferrous sulfate mixtures. In addition, shake flask leaching experiments showed that cinnabar had little effect on pyrite oxidation at 1% (wt/wt) but inhibited growth of mercury-sensitive and mercury-resistant strains at 10%. Mercury-resistant strains were unable to grow on cinnabar as an energy source.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

Reference28 articles.

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4. Bacterial leaching patterns on pyrite crystal surfaces;Bennett J. C.;J. Bacteriol.,1978

5. Application of a gas chromatograph-atomic absorption detection system to a survey of mercury transformations by Chesapeake Bay microorganisms;Blair W. R.;Chemosphere,1974

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