Accumulation and biotransformation of arsenic by water bloom

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Authors	MACHÁT Jiří KONEČNÁ Marie ČMELÍK Jiří
Year of publication	2008
Type	Conference abstract
MU Faculty or unit	Faculty of Science
Citation
Description	Biomass of freshwater cyanobacteria (water bloom) is well known as an efficient biosorbent for heavy metal ions. In this work sorption and biotransformation of arsenate by water bloom (predominantly Microcystis sp.) has been studied. Biomass was cultivated in natural water enriched by arsenate for 138 hours. Up to 35% of arsenic has been found associated with biomass. Arsenic species in water and biomass were determined. Quantitative reduction of arsenate to arsenite followed by biomethylation and releasing mainly dimethylarsinate (DMA) into water were observed. Monomethylarsonate (MMA), DMA and both inorganic species were determined in biomass extract. Besides these species, several unknown As species were found in biomass and identified by further techniques as MMA(III) and arsenoribosides. Natural biomass contains 40% As in form of arsenoriboside. Up to 56% of arsenate content in water has been methylated by cyanobacterial biomass.
Related projects:	Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)