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STRUCTURAL CHARACTERIZATION OF SULFONATED AZO DYES USING LIQUID SECONDARY ION MASS SPECTROMETRY/TANDEM MASS SPECTROMETRY
Citation:
Richardson, S., J. McGuire, A. Thruston, Jr., AND G. Gaughman. STRUCTURAL CHARACTERIZATION OF SULFONATED AZO DYES USING LIQUID SECONDARY ION MASS SPECTROMETRY/TANDEM MASS SPECTROMETRY. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-92/179 (NTIS PB92188861).
Description:
Eight monosulfonated and disulfonated azo dyes were analyzed using liquid secondary ion mass spectrometry/tandem mass spectrometry, in the negative ion mode, under low-energy conditions (110-150 eV). any structurally characteristic fragment ions were obtained, several of which have not been reported previously using other mass spectrometric techniques. ong the structurally important ions observed were those due to loss of SO2, SO3 and various aromatic substituents, such as NO2 and NHCOCH3. osses of N2 also were proposed. n addition, product ions due to cleavage at the azo linkage were observed, and also SO3- and HSO3- ions. everal of the azo cleavage product ions detected did not contain sulfonate groups. ossible pathways for the formation of product ions are proposed. he structural information obtained should help to better characterize and identify sulfonated azo dyes in the future.