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Copper complexation capacity of marine water samples from southern California.

The ability of a variety of natural water samples from southern California to complex cupric ion was measured by using anodic stripping voltammetry (ASV) and a technique employing algal bioassay. Samples investigated ranged from oceanic waters to a freshwater lake which drained into a coastal lagoon. According to ASV results, complexation capacity ranged from undetectable to 0.93 pM Cu2+/L. The difference between ECjo values obtained from bioassays using a 0.45-pm filtered and ultrafiltered ( G O O M,) water was used to measure the reduction in free cupric ion by high-molecular-weight compounds. Cupric ion EC50 values differed by up to 2.3 pM between filtered and ultrafiltered samples. The correlation between results using the titration method and the bioassay technique was 0.993. Quantitative differences between chemical measures of complexation and biological effect indicated the importance of verifying the accuracy of chemical techniques used to measure complexation capacity. Results of the survey suggested that coastal lagoons provide a useful test site for study of the dynamics of complexing compounds in the marine environment.