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

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Abstract

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 Zn2+ 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 Zn2+ 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.

Original languageEnglish
Pages (from-to)629-641
Number of pages13
JournalBiodegradation
Volume20
Issue number5
DOIs
Publication statusPublished - 2009

Keywords

  • Accumulation
  • Bioremediation
  • Metal uptake
  • Microalgae
  • pH

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