The absorption spectra of W-, Mo-, and Ti-phenylfluorone-cetyltrimethylammonium bromide complexes and the optimum conditions for the simultaneous spectrophotometric determination of microamounts of W, Mo, and Ti were studied. In order to examine the effect of the errors of calibration matrix on the anal. results, the approach of selecting the anal. wavelengths was investigated and the comparison of computation results between AKC method (the matrix representation of Beer-Lambert's law) and CPA method (the inverse expression of Beer-Lambert's law) at different wavelength positions was made with their prediction errors. It showed that under experimental conditions, both the accuracy and the precision of the AKC method using 10 wavelengths for determination were better then those of CPA method. The standard mixtures containing microamounts of W, Mo, and Ti in different concentration ratio were determine with satisfactory results. The present method constitutes a simple and fast method for the simultaneous determination of microamount of W, Mo, and Ti.

Key words: SPECTROPHOTOMETRY, MULTICOMPONENT SYSTEM, XANTHENONE P, MATRIX METHOD, MICRO ANALYSIS, COMPUTER APPLICATIONS, TITANIUM, TRIMETHYLALKYLAMMONIUM, BENZENE P, MOLYBDENUM