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Uptake and depuration kinetics of arsenatein Microcystis aeruginosaunder different phosphate regimes |
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Abstract The uptake and depuration kinetics of arsenate inMicrocystis aeruginosa (M. aeruginosa) were investigatedunder phosphate-enriched (+P) and depleted (–P) culture conditions. Similarly, M. aeruginosa, pre-exposed to 10μmol/L arsenate for 24 hours under +P conditions, were used to examine arsenic efflux and species changes in culture media during 13 days depurations under +P and–P conditions. Results showed that P-depletion was found to significantly improve the accumulation of arsenate in Microcystis aeruginosa, in which the algae with high accumulated amounts of arsenic had high risks due to arsenic rapid efflux. Additionally, ca. 41.5% and 46.3%intracellular arseniccould be rapidly excreted in rapidclearance phase (2h) under +P and –P conditions, respectively. During the depuration period, arsenate efflux was the crucial process from algae cells in +P media, but arsenate reduction and methylation were observed in –Pmedia. This indicates significant differences inM. aeruginosa depuration mechanism under different phosphorus conditions.
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Received: 20 May 2014
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