METAL SEDIMENT INTERACTION DURING RESUSPENSION

A calibrated shaker was used to resuspend sediments from Hamilton Harb our, Ontario at different shear stresses. The flocs formed by resuspen sion were irreversible and increased in size and number with increasin g shear. Individual particle size was constant at about 0.1 mum for th e different flocs and independent of shear, but agglomeration size inc reased with shear. H-ion exchange as a function of sediment concentrat ion fits a Langmuir type function well. Exchange of total Ba, Ca, Cd, Cr, Cu, Mg, Ni, Pb and Zn with H+ were determined for the different sh ear regimes which covered quiescence to gale conditions. A simple lump ed one intrinsic constant and fixed capacitance electrostatic model is used to fit the exchange data for each divalent metal.