Inhibition of sulphate reduction in anoxic marine sediment by Group VI anions期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Inhibition of sulphate reduction in anoxic marine sediment by Group VI anions

Authors:	Ibrahim M Banat David B Nedwell

Institution:	Department of Biology, University of Essex, Colchester CO4 3SO, Essex UK

Abstract:	The addition of various concentrations (1, 10 and 20 mM) of Group VI anions to sediment slurry resulted in inhibition of the rate of sulphate reduction at the two higher concentrations, the degree of inhibition being in the order of molyb-date $(MoO_{4}^{=})>selenate(SeO_{4}^{=})>tungstate(WO_{4}^{=})$ . The addition of 20 mM concentrations of these inhibitors almost entirely eliminated sulphate reduction. Doubling the sulphate concentration while using the highest concentration of inhibitors (20 mM) led to the re-establishment of some sulphate reduction in the $SeO_{4}^{=}$ and $WO_{4}^{=}$ treated slurries whereas no such reversal was noticed with $MoO_{4}^{=}$ . These observations suggested that $SeO_{4}^{=}$ and $WO_{4}^{=}$ are competitive inhibitors of sulphate reduction, while $MoO_{4}^{=}$ is a non-competitive inhibitor.

Keywords:	inhibitors sulfates anoxic conditions anions
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