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Characterization of Desmodesmus pleiomorphus isolated from a heavy metal-contaminated site: biosorption of zinc



Characterization of Desmodesmus pleiomorphus isolated from a heavy metal-contaminated site: biosorption of zinc



Biodegradation 20(5): 629-641



Microalgae have been proven efficient biological vectors for heavy metal uptake. In order to further study their biosorption potential, a strain of Desmodesmus pleiomorphus (L) was isolated from a strongly contaminated industrial site in Portugal. Under different initial Zn(2+) concentrations, metal removal by that strain reached a maximum of 360 mg Zn/g biomass after 7 days, at 30 mg Zn/l, after an initial rapid phase of uptake. Comparative studies were carried out using a strain of the same microalgal species that is commercially available (ACOI 561): when exposed to 30 mg Zn/l, it could remove only 81.8 mg Zn/g biomass. Biosorption experiments using inactivated biomass of the isolated strain reached a maximum Zn(2+) uptake of 103.7 mg/g. Metal removal at various initial pH values was studied as well; higher removal was obtained at pH 5.0. The microalga strain L, isolated from the contaminated site, exhibited a much higher removal capacity than the commercial strain, and the living biomass yielded higher levels of metal removal than its inactivated form.

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Accession: 024311586

Download citation: RISBibTeXText

PMID: 19225897

DOI: 10.1007/s10532-009-9250-6


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