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Biotransformation of mercury by bacteria isolated from a river collecting cinnabar mine waters

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Abstract

One hundred six strains of aerobic bacteria were isolated from the Fiora River which drains an area of cinnabar deposits in southern Tuscany, Italy. Thirty-seven of the strains grew on an agar medium containing 10μg/ml Hg (as HgCl2) with all of these strains producing elemental mercury. Seven of the 37 strains also degraded methylmercury. None of 106 sensitive and resistant strains produced detectable monomethylmercury although 15 strains produced a benzene-soluble mercury species. Two strains of alkylmercury (methyl-, ethyl- and phenylmercury) degrading bacteria were tested for the ability to degrade several other analogous organometals and organic compounds, but no activity was detected toward these compounds. Mercury methylation is not a mechanism of Hg resistance in aerobic bacteria from this environment. Growth of bacteria on the agar medium containing 10μg/ml HgCl2 was diagnostic for Hg detoxification based on reduction.

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Authors and Affiliations

  1. Dipartimento di Biologia Ambientale, Universita di Siena, Siena, Italy

    Franco Baldi

  2. Laboratorio Chimico d'Igiene e Profilassi, La Spezia, Italy

    Marco Filippelli

  3. Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USA

    Gregory J. Olson

Authors
  1. Franco Baldi
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  2. Marco Filippelli
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  3. Gregory J. Olson
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Baldi, F., Filippelli, M. & Olson, G.J. Biotransformation of mercury by bacteria isolated from a river collecting cinnabar mine waters. Microb Ecol 17, 263–274 (1989). https://doi.org/10.1007/BF02012839

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