Cobalt toxicity in anaerobic granular sludge: influence of chemical speciation.

Journal of Industrial Microbiology & Biotechnology
Jan BartacekPiet N L Lens

Abstract

The influence of cobalt speciation on the toxicity of cobalt to methylotrophic methanogenesis in anaerobic granular sludge was investigated. The cobalt speciation was studied with three different media that contained varying concentrations of complexing ligands [carbonates, phosphates and ethylenediaminetetraacetic acid (EDTA)]. Three fractions (nominal added, dissolved and free) of cobalt were determined in the liquid media and were correlated with data from batch toxicity experiments. The average concentration of cobalt that was required for 50% inhibition of methanogenic activity (IC50) for free Co2+ in the three sets of measurements was 13 micromol/L with a standard deviation of 22% and a similarity of 72% between the data obtained in the three different media for the range of cobalt concentrations investigated. The standard deviation of the IC50 for the other two fractions was much higher, i.e. 85 and 144% for the added cobalt and dissolved cobalt, respectively, and the similarity was almost 0% for both fractions. Complexation (and precipitation) with EDTA, phosphates and carbonates was shown to decrease the toxicity of cobalt on methylotrophic methanogenesis. The free cobalt concentration is proposed to be the key paramet...Continue Reading

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Feb 20, 2008·Journal of Industrial Microbiology & Biotechnology·Fernando G FermosoPiet N L Lens

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Citations

Dec 29, 2015·Biotechnology Advances·Pham Minh ThanhDavid Stuckey
Dec 19, 2008·The Science of the Total Environment·Fernando G FermosoPiet N L Lens
Mar 13, 2010·Analytical Chemistry·Flora Alonso VegaWillem H Van Riemsdijk

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