Jul 28, 2012

Bioaccumulation and biosorption of copper and lead by a unicellular algae Chlamydomonas reinhardtii in single and binary metal systems: a comparative study

Journal of Environmental Management
Roula Flouty, Georgette Estephane

Abstract

A comparative evaluation of bioaccumulation and biosorption of Cu (II) and Pb (II) ions by algal cells of Chlamydomonas reinhardtii was conducted in single and binary metal systems. Experiments were performed in solutions containing 5 × 10(-7) M of free metal at 30 °C and pH 6. Algal cells were used in the concentration of 0.2 g/L. Both processes tend to be more important as contact time between heavy metals and algal cells increases. Under studied conditions, dead cells showed higher removal efficiency than living cells for both metal ions. Removal efficiency of Pb increases from 8% to 40% when comparing the results obtained by living cells and dead cells. For Cu (II) ions, the removal efficiency of dead cells was about 2 times higher than living cells (55% vs. 28%). Living cells showed similar bioaccumulation capacity for both ions. Synergistic and antagonistic effects between copper and lead were observed in binary metal systems which imply that bioaccumulation process is much more dynamic than assumed in the equilibrium models. In contrast, dead algal cells showed a higher affinity for Pb (II) ions compared to Cu (II) ions and no competitive effect was observed in the biosorption of copper and lead by the inert cells in bin...Continue Reading

Mentioned in this Paper

Microorganism
Metabolic Process, Cellular
Calabaria reinhardtii
Extracellular
Chaetophora elegans
Protoplasm
Uptake
Chlorella vulgaris
Process of Absorption
Spectrophotometry, Atomic

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