SIMULTANEOUS DETERMINATION OF MIXTURES IN LIQUID BY LASER-INDUCED PHOTOACOUSTIC-SPECTROSCOPY

Laser-induced photoacoustic spectroscopy (LIPAS) has been applied to the determination of binary liquid mixtures. Using tar food dyes such as Amaranth, New Coccine and Sunset Yellow FCF, the additlvity of the photoacoustic signal intensity was examined. The analysis of mixtures of ultra low concentrations of the above dyes in water clearly showed that LIPAS was applicable to the simultaneous determination of mixtures with highly overlapping absorption spectra, the mixtures which have been extremely difficult to analyze by conventional colorimetric and dual-wavelength absorption spectrometry. © 1979, American Chemical Society. All rights reserved.