Formation of sphalerite (ZnS) deposits in natural biofilms of sulfate-reducing bacteria.
Science
; 290(5497): 1744-7, 2000 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-11099408
ABSTRACT
Abundant, micrometer-scale, spherical aggregates of 2- to 5-nanometer-diameter sphalerite (ZnS) particles formed within natural biofilms dominated by relatively aerotolerant sulfate-reducing bacteria of the family Desulfobacteriaceae. The biofilm zinc concentration is about 10(6) times that of associated groundwater (0.09 to 1.1 parts per million zinc). Sphalerite also concentrates arsenic (0.01 weight %) and selenium (0.004 weight %). The almost monomineralic product results from buffering of sulfide concentrations at low values by sphalerite precipitation. These results show how microbes control metal concentrations in groundwater- and wetland-based remediation systems and suggest biological routes for formation of some low-temperature ZnS deposits.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sulfetos
/
Bactérias Redutoras de Enxofre
/
Compostos de Zinco
/
Biofilmes
/
Sedimentos Geológicos
/
Deltaproteobacteria
Idioma:
En
Revista:
Science
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Estados Unidos