Cadmium biosorption and toxicity to laboratory ‐ grown bacteria

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Abstract
Cadmium uptake by Pseudomonas fluorescens cells could be described by a Freundlich isotherm suggesting that adsorption was the major process of cadmium uptake by bacteria. Standardization of culture conditions appears to be necessary as a 30 per cent difference was obtained in cadmium uptake for bacteria grown for 15h and 14.5h respectively. Cadmium concentration inhibiting 50 per cent of growth rate and biomass production or increasing the lag phase by a factor 2 was approximately 3 ppm for a first exposure of Ps. fluorescens. The use of two Klebsiella aerogenes strains (high and low capsule producers) confirmed a protective effect of exopolysaccharides against cadmium.