Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 165, Issue 1-3, Pages 486-493Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2008.10.010
Keywords
Microalga; Metal; Toxicity; Removal; Sulfhydryl groups
Categories
Funding
- Plan Nacional de I + D [REM 2000-0458HIB]
- Universidade da Corufia
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Cadmium tolerance and removal in the marine microalga Dunaliella salina were studied in cultures exposed to different metal concentrations (5-120 mg Cd l(-1)) for 96h. This microalga can be included in the group of microalgal species most tolerant to cadmium due to the high value of EC50 that it possesses (48.9 mg Cd l(-1) at 96 h of culture). The greater percentage of cadmium removed was obtained in cultures exposed to 5 mg Cd l(-1) at 96 h, but removing only 11.3% of the added cadmium. In all cultures, the quantity of cadmium removed intracellularly was much lower than the bioadsorbed quantity and it was proportional to the sulfhydryl group levels. Both the Freundlich and Langmuir adsorption models were suitable for describing the short-term biosorption of cadmium by living cells of D. salina. (C) 2008 Elsevier B.V. All rights reserved.
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