Chemiluminescence determination of dissolved copper(II) in natural waters

s The catalytic effect of copper(II) on the chemiluminescence reaction of luminol oxidation in the presence of some modeling organic substances of natural waters, i.e., EDTA and citric and glutamic acids, is studied. A comparison of the data obtained with the calculated profiles of copper distribution among the dissolved forms in model solutions revealed that the binding of copper to citrate does not affects and its binding with the other organic reagents reduces the catalytic effect of copper(II) in the chemiluminescence reaction. Free ions and monohydroxo complexes of copper(II) demonstrate the highest activity in the CL reaction. The chemiluminescence method is applicable to the direct (with no preliminary separation) determination of labile copper species in natural surface waters.