Abstrait

Estimation of copper in brass by iodo-potentiometric technique of analysis

H.C.Anandamurthy, O.G.Palanna

The basic principle used for the estimation of copper in brass is iodometry. Many modifications were proposed to improve the results for quantitative estimation of copper in brass. In the present investigation, prime importance is given to redox potentials of the analyte solution and the measurements are carried out by iodo-potentiometric technique. All the potential measurements are recorded at their respective concentrations and buffer media. The out come of the investigation is that copper in brass can be estimated effectively at pHbetween 2.0 and 3.5 usingNaOHand CH3COOH. A linear relationship is obtained for measured potentials E1, E2 and (E1 - E2) when plotted against the molar concentration of copper or weight of brass taken . The results are in conformity with the results of titrimetric data for the weight of brass samples. Identical results are observed for these two techniques. A calibration plot is obtained by plotting molar concentration (M) of copper in salt and brass with their corresponding measured values of potentials (E1) under the conditions of investigation. The determination ofmolar concentration of copper is feasible fromthe linear plot graph, if the potential (E1) of copper solution is known potentiometrically; and hence, its percentage.