The Cumulation of Toxic Metals on Alga

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Abstract
The cumulation of zinc, cadmium, mercury(II), chromium(III)(VI), arsenic(III)(V), methylarsonic acid and dimethylarsinic acid on alga Chlorella kessleri has been radiometrically investigated in the pH range from 4 to 10.5. It has been found that algal cells strongly cumulate hydrogen ions and change by this manner the initial pH-value. The cumulation factor of zinc and cadmium increases with the increase of equilibrium pH whereas the cumulation of other species studied does not depend on pH in a certain pH-region. In neutral medium the cumulation factor decreases in the order: chromium(III), mercury(II), zinc, cadmium, arsenic(V), methylarsonic acid and dimethylarsinic acid. General conclusions concerning the influence of different factors on the cumulation of toxic metals on alga are included.