UPTAKE OF HEAVY-METALS BY CLADOPHORA-GLOMERATA

The influence of the duration of exposure on the accumulation of Pb, Cu, Cd, Cr, Co Zn and Ni by Cladophora glomerata was studied in short-term batch experiments. It was determined that the uptake of heavy metals differs not only in the rate of uptake but also in the maximum cumulation attained. The highest uptake after exposure for 6 h to an initial concentration of 200-mu-g/l occurred with chromium - 168-mu-g/g, the minimum uptake occurred with cobalt - 86.9-mu-g/g. Also the rate of uptake differed significantly. After the exposure period of 15 min 120.7-mu-g/g of chromium was taken up and, in contrast, only 7.6-mu-g/g of nickel was taken up after the same exposure period.