SORPTION OF 1,2,3,4-TETRACHLOROBENZENE AND CADMIUM TO SEDIMENTS AND SUSPENDED-SOLIDS IN LAKE VOLKERAK ZOOM

Sediment and suspended solid samples were collected from Lake Volkerak/Zoom in The Netherlands. The samples were used for the determination of 1,2,3,4-tetrachlorobenzene and cadmium sorption coefficients and for the determination of the concentrations of total iron, manganese, organic carbon, chlorophyll-a and scandium. Cadmium sorption coefficients were also determined for isolated suspensions of Cryptomonas spp. A statistical analysis of the results indicates that the sorption coefficients for tetrachlorobenzene are proportional to the organic carbon content, which is highly influenced by algal blooms. A similar analysis shows that cadmium is bound almost completely to the geochemical iron, manganese and organic phases, the first being exclusively associated with the clay fraction. Due to a decrease in relative clay content during algal blooms, a proportional decrease in the cadmium distribution coefficient was found. It was found that the data obtained from the statistical analysis are in good agreement with reported data for isolated model phases.