DETERMINATION OF 3-COMPONENT MIXTURE BY EQUAL-ABSORPTIVE WAVELENGTH SPECTROPHOTOMETRY AND LINEAR PLOT METHOD

A method of equal-absorptive wavelength spectrophotometry was applied to the quantitative analysis of three-component mixtures with serious overlapping spectra. This method was carried out as following: Several pairs of wavelength with equal absorbance of the third (interfering) component were selected and the absorbances of the mixture at these se lected wavelengths were recorded. Then the measurements were treated b y using the linear equation proposed in this paper and a linear plot w as obtained. The concentrations of the first two components were thus obtained from the slope and the intercept of this linear line, respect ively. Based on the property of additivity of absorbances, the concent ration of the third component (interfering) can then be obtained. This proposed method offers advantage of simplicity and it has been applie d to the analysis of ternary mixture of tungsten, molybdenum and germa nium using the colour reaction with phenylfluorone (PF) and cetyltrime thylammonium bromide(CTMAB).