Identification and Determination of Alkylxanthogenates by Laser Raman Spectrometry

Abstract

For the direct analysis of alkylxanthogenates (RO-CSS-K⁺), a new method with laser Raman spectrometry was developed. The Raman spectra of eleven C₁-C₅ alkylxanthogenates with normal and branched chains in both solid states and solution were measured in the 1200-200cm^-1 region, and their identification by use of each of the characteristic Raman l ines was attempted. The Raman spectra were measured with 488 nm line of Ar+ laser with 200 mW power. The Raman line due to v_s(-CS₂-) stretching vibrations and skeletal deformations of alkyl groups were mainly observed in the 700-200 cm^-1 region. These Raman spectra exhibited characteristic patterns for the alkylxanthogenates. The Raman lines observed for solution samples were shown to be useful for the identification of isomers. A characteristic line table for the identification of each of the alkylxanthogenates was made up from the spectra. In addition, the characteristic lines was used to determine of alkylxanthogenates. The relation between the peak intensities and concentrations of the alkylxanthogenates was linear, when thiocyanate ion was used as an internal standard. It was shown that the simultaneous determination of some of the alkylxanthogenates is possible. This Raman spectrometric method was applied to the analysis of the practical samples used as the collectors in flotation, and satisfactory results were obtained. It was proved that this spectrometric method is useful for the qualitative and quantitative analysis of alkylxanthogenates.