Studies on Precision and Accuracy In Microdetermination of Transition Metals Using Ternary Complex EAB-CTAB-Metals

Abstract

Complexometric and Analytical studies have carried out by forming ternary complex between Eriochrome Azurol B, and Cetyl Trimethyl Ammonium Bromide CTAB; and some transition metal ions mainly Cu2+, Ni2+ and Cd2+. The absorption spectra of Eriochrome Azurol B ,EAB; a triphenylmethane dye, has studied in the presence as well as in the absence of surfactant, Cetyl Trimethyl Ammonium Bromide, CTAB at pH values ranging from pH 1.00 to 12.00. Hypsochromic shift is observed in the absorption spectra in the presence of surfactant pK values i.e. dissociation constant values are found to decreased, in the presence of surfactant is observed. Composition of chelates EAB:CTAB:Metal is found to be 1:1:1, and effect of foreign ions such as chlorides, nitrates; and sulphates of sodium, potassium and ammonium; has been studied in detail. Stability constants of the chelates are determined. Sensitivity and Stability of chelates formedincreases in the presence of surfactant. Various analytical parameters including range of adherence to Beers Law, Molar Extinction Constants, Sandells Sensitivity, were studied for all systems by its interaction with and without CTAB. Precision and Accuracy of the method suggested for microdetermination of metal ions is determined and found out that method is both precise as well as accurate.