Abstract
The present paper summarizes an approach recently proposed in The Netherlands to use the equilibrium partitioning (EP) method to derive a coherent set of quality criteria for aquatic systems. The quality criteria refer to dissolved concentrations, the concentrations in the suspended particles, the total (dissolved + particulate) concentrations and the concentrations in the sediment. The quality criteria have been derived for standard sediment, standard water and standard suspended matter. Emphasis is laid on the relation between effect data and physicochemical data. Two types of effect data have been used, i.e. effects on aquatic toxicity (direct effects) and health related effects (product standards). Both types of data have been translated into the above mentioned criteria by means of EP. For the calculation of criteria in sediment and suspended matter solids-water partition coefficient K sw have been used. Examples have been given for cadmium and hexachlorobenzene. The handled equations have been summarized in diagrams.
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