Abstract
Some concepts of hydrochemical water quality in estuaries are discussed from the point of view of time and space. The relations of metal and other substances with chloride as conservative property are questioned with respect to time, space and presence of particulate matter. Some examples are presented for phosphorus budgets of the Dutch Wadden Sea and Lake Grevelingen in order to demonstrate the various impacts determining estuarine conditions. The effects of non-attached particulate metals and slow solid-binding processes of metals and radionuclides onto particles have to be considered for estuarine studies. At the same time a start should be made to determine the residence times of natural and anthropogenic substances in the estuaries which reflect also the human activities on the estuaries and thus the resulting changes in the natural equilibria.
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