Mar 29, 2002

Physicochemical aspects of lead bioaccumulation by Chlorella vulgaris

Environmental Science & Technology
Vera I Slaveykova, Kevin J Wilkinson

Abstract

The relationship between lead speciation and its bioaccumulation by the alga Chlorella vulgaris was studied in the absence and presence of nitrilotriacetic, iminodiacetic, malonic, and citric acids. Pb uptake fluxes were rigorously analyzed by considering the simultaneous effects of metal transport in the medium coupled with metal complex dissociation kinetics. Under the conditions examined here, lead biouptake by C. vulgaris was governed by the free lead ion activity. Potentially labile hydrophilic complexes such as lead citrate and lead malonate did not contribute to the internalization fluxes. Kinetic modeling of the mass transport, adsorption reactions, and internalization fluxes confirmed the rate limiting role of the internalization flux. Comparison of the internalization and diffusive fluxes revealed that even in the presence of a large excess of Pb complexes, the supply of free ion (Pb2+) was sufficient to account for the observed Pb uptake. Pb adsorption to the cell surface was described by Langmuir isotherm. A new method was proposed as a means to estimate the number of Pb occupied transport sites at steady state. The apparent stability constant for the interaction of Pb with transport sites was determined to be 10(5....Continue Reading

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Mentioned in this Paper

Carlina vulgaris
Cribraria vulgaris
Calluna vulgaris
Complex (molecular entity)
Uptake
Chlorella vulgaris
Citrate Measurement
Caenorhabditis remanei
Adsorption
Water Pollutants

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