New opportunities in the determination of inorganic compounds in water by the method of laser raman spectroscopy

Abstract

The characteristic peculiarities of the valence band shape of Raman scattering by water molecules in the solutions of KBr, KCl, KI, NaCl, and NaI electrolytes have been revealed. These peculiarities allowed us to perform noncontact recognition of salt type and determination of salt concentration in water solutions by means of artificial neural networks. We suppose that the classification algorithms applied in this study, which use artificial neural networks, may also be useful for other problems in Raman spectroscopy, in fluorimetry, and in application of these methods in ecology. Use of laser radiation for exciting Raman and fluorescence bands provides high spectral resolution that registers even weak bands. This may turn out to be key for the implemen- tation of the approach developed here in the identification of a wide class of objects in aqueous and other liquid media.