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The effect of NaCl concentration on cadmium uptake by DunaLiella salina was investigated. Algae were grown in the presence of 5 mg I-' cadmium at NaCl concentrations varying from 0.5 M to 4 M. The response of cell-specific growth rate, pigment content, and cadmium uptake was studied. Results show maximum cadmium uptake at NaCl concentrations between 0.5 and 1.0 M and considerably lower cadmiuni uptake at NaCl concentrations above 1.0 M. It is suggested that of the Cd species existing under the experimental conditions, the positively charged Cd", CdC1' and possibly the uncharged CdC12(aq) play a major role in cadmium uptake processes.

The unicellular halotolerant alga Dundiella s a l~n a was exposed to different concentrations of cadmium in the range 9 to 135 PM. Chlorosis was observed at 25 FM cadmium, and inhibition of cell division was established at 45 uM cadmium. Blosynthesis of the cellular osmoregulator, glycerol, was not affected by cadmium toxicity throughout the concentration range. Cadmium toxlcity was found to be antagonized by low concentrations of manganese. Michaehs-Menten analysis of substrate (Mn2+)

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