Ferrous iron oxidation by Thiobacillus ferrooxidans: inhibition with benzoic acid, sorbic acid, and sodium lauryl sulfate
Thiobacillus ferrooxidans promote indirect oxidation of pyrite through the catalysis of the oxidation of ferrous iron to ferric iron, which is an effective oxidant of pyrite. These bacteria also may catalyze direct oxidation of pyrite by oxygen. A number of organic compounds, under laboratory conditions, can apparently inhibit both the oxidation of ferrous iron to ferric iron by T. ferrooxidans and the weathering of pyritic material by mixed cultures of acid mine drainage microorganisms. In this study, benzoic acid, sorbic acid, and sodium lauryl sulfate at low concentrations (5 to 10 mg/liter) each effectively inhibited bacterial oxidation of ferrous iron in batch cultures of Thiobacillus ferrooxidans. The rate of chemical oxidation of ferrous iron in low-pH, sterile batch reactors was not substantially affected at the tested concentrations (5 to 50 mg/liter) of any of the compounds.
- Research Organization:
- Bureau of Mines, Pittsburgh, PA
- OSTI ID:
- 6098528
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Journal Name: Appl. Environ. Microbiol.; (United States) Vol. 48:1; ISSN AEMID
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010900* -- Coal
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560302 -- Chemicals Metabolism & Toxicology-- Microorganisms-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID MINE DRAINAGE
ALKALI METAL COMPOUNDS
BACILLUS
BACTERIA
BATCH CULTURE
BENZOIC ACID
CARBOXYLIC ACIDS
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
DISSOLUTION
ELEMENTS
ESTERS
INHIBITION
IRON
IRON COMPOUNDS
IRON SULFIDES
LEACHING
METALS
MICROORGANISMS
MINERALS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDATION
PH VALUE
PYRITE
RESPONSE MODIFYING FACTORS
SEPARATION PROCESSES
SODIUM COMPOUNDS
SORBIC ACID
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SULFUR-OXIDIZING BACTERIA
SULFURIC ACID ESTERS
THIOBACILLUS FERROXIDANS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS