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Inhibition of ferrous ion oxidation in Thiobacillus ferrooxidans in the presence of oxyanions of sulfur and phosphorus

Hoffmann, Michael R. and Hiltunen, Paula and Tuovinen, Olli H. (1986) Inhibition of ferrous ion oxidation in Thiobacillus ferrooxidans in the presence of oxyanions of sulfur and phosphorus. Coal Science and Technology, 9 . pp. 683-698. ISSN 0167-9449. http://resolver.caltech.edu/CaltechAUTHORS:20150827-071734546

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Abstract

Ferrus iron oxidation by growing cultures of Thiobacillus ferrooxidans was sensitive to negative catalysis (inhibition) by selected oxyanios of sulfur. The relative order of negative catalytic activity for the sulfoxyanions was S_20_5^(2-) > S_20_3^(2-) > S_20_4^(2-) > S_40_6^(2-). Inhibition by the sulfoxyanions was greater at μm 1.5 than at pH 2.0. A mechanism involving the formation of radical intermediates, HO_2,-OH, HSO_3, HSO_5, H_2O_4, and HS_3O_3, induced by Fe(II) and Fe(III) complexes is proposed to account for the observed inhibitory effects. Orthophosphate, pyrophosphate, and tripolyphosphate compounds were also inhibitory to ferrous iron oxidation by T. ferrooxidans. Orthophosphates were increasingly at high concentrations (200-300 mM) whereas the apparent toxicity of pyrophosphate and tripolyphosphate was inversely related to concentration over the range of 50-300 mM with no apparent at pH dependency at pH ≤ 2. Equilibrium models are presented to explain the relative effect of the phosphates in terms of phosphate precipitates, which were actually observed , and soluble complexes, which have an effect on the thermodynamics of electron transfer.


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http://cat.inist.fr/?aModele=afficheN&cpsidt=8397316PublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 1986 Elseiver. The work was supported with funds from the Ministry of Trade and Industry, Finland (O.H.T. and P.H.) the Ohio Coal Research Laboratories Association, Contract OCRLA-6 (O.H.T.), and the Ohio Air Quality Development Authority (O.H.T.) We thank Mary Fuller for typing the manuscript.
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Ministry of Trade and Industry, FinlandUNSPECIFIED
Ohio Coal Research Laboratories AssociationOCRLA-6
Ohio Air Quality Development AuthorityUNSPECIFIED
Record Number:CaltechAUTHORS:20150827-071734546
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150827-071734546
Official Citation:Inhibition of ferrous ion oxidation by Thiobacillus ferrooxidans in the presence of oxyanions of sulfur and phosphorus MR Hoffmann, P Hiltunen, OH Tuovinen Coal science and technology 9, 683-698
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59916
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:11 Sep 2015 23:34
Last Modified:11 Sep 2015 23:34

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