Beschreibung:
Distribution coefficients for suspended sediments may be estimated from water and sediment quality variables, using detailed conceptual chemical models or semi-empirical models. The predicted KD values find application in trace metal fate modelling and risk assessment. The detailed chemical model SWAMP (Sediment Water Algorithm for Metal Partitioning) which expresses trace metal distribution coefficients as a function of environmental variables and sediment characteristics was used to described field KD values. Besides SWAMP, semi-empirical models were derived from field-KD values. The field KD-values for Cd, Cu, Ni, Pb and Zn were measured on samples taken monthly from four surface waters in The Netherlands. In this paper we discuss the differences between the two modeling approaches.