The equilibrium constants and oxygenation constants of diethylenetriamine,triethylenettramine Co(Ⅱ) complex were determined by pH potentionmetric method.Some new oxygenated species and their oxygenation constants were found.The oxygenated species and their formation conditions investigated by potentiometry were verified by spectrophotometry.Results of the two methods were consistant with one another very well showing the correctness of the results of potentiometry.
