Abstract
Abstract Hourly variation of copper(II) complexing capacity (CuCC) of water samples from the Kiryu River in Gunma prefecture was investigated. From the stand point of complexing capacity, the present water samples could be classified into two types, that is, the daytime type and the nighttime one. Water sampled belonging to the former type contained some ligands derived from human activity, and naturally occurring ligands were mainly found in water samples belonging to the latter. The estimation of stability constant for copper(II) complex in water samples was also carried out on the basis of a single ligand model.
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