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Copper complexation capacity in waters and effluents – limitations of using DOC or colour as general predictors

Abstract It has been proposed that measures of organic carbon might be used to predict complexation capacity. The relationship between dissolved organic carbon, colour (absorbance at 400nm) and copper complexation capacity has been examined. Comparisons of data for surface freshwaters collected from 28 sites in England show no significant correlation. For estuarine samples, it seems that colour and complexation capacity do co-vary. This is explained as the mixing of relatively coloured river water rich in ligands with uncoloured seawater of low ligand concentration. DOC and complexation capacity in sewage effluent show a strong correlation that might form the basis of a predictive relationship.