APPLICATION OF MULTICOMPONENT ANALYSIS TO THE SIMULTANEOUS RESOLUTION OF PHENOL COMPOUNDS IN MIXTURES .1. DEVELOPMENT OF THE CALCULATION METHODS AND EXPERIMENTAL METHODOLOGY

The computer program MULTI3, which includes new calibration methods for the resolution of mixtures of analytes by multiple linear regression from data provided by a diode-array spectrophotometer, was developed. The different calibration methods available, which include those of the single standard, multiple standards and multiple addition of standard, are described. The program was applied to the resolution of mixtures of up to nine phenol compounds by using the different calibration alternatives on the normal and first- and second-derivative absorption spectra. The sets of results thus obtained are critically compared.