Determination of Properties of Trace Copper Complex Solution by β-Correction Spectrophotometry

Abstract

The reactions were sensitive between copper(II) and dibromo-o-carboxy-chlorophosphonazo

(DBKCPA) and pH 7 and between copper(II) and o-sulfobenzeneazo

rhodanine (SBAR) at pH 9.5 in the presence of cetyl

trimethylammonium bromide (CTMAB). Because of the serious interference

of excess ligand the determination of properties of Cu complex solutions was

carried out by  β-correction theory instead of the single wavelength method.

This investigation gave the simple determination of the complex ratio, stepwise

real molar absorptivity (ε) and stepwise or cumulative stability constant (K).