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Main Title Environmental Applications of Thermospray LCMS: Qualitative Analysis of Sulfonated Azo Dyes.
Author Flory, D. A. ; McLean, M. M. ; Vestal, M. I. ; Betowski, L. D. ;
CORP Author Houston Univ., TX.;Environmental Monitoring Systems Lab., Las Vegas, NV.
Year Published 1987
Report Number EPA-R-812877; EPA/600/J-87/249;
Stock Number PB88-177084
Additional Subjects Azo dyes ; Chromatographic analysis ; Industrial wastes ; Sulfonates ; Mass spectroscopy ; Pollution ; Tables(Data) ; Effluents ; Ionization ; Qualitative analysis ; Reprints ;
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NTIS  PB88-177084 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 5p
Abstract Thermospray mass spectra (TSMS) has been used to obtain mass spectra of several di- and tetra- sulfonated azo dyes. Commercial dye preparations were dissolved in various mobile phases and injected into the TSMS system. Mobile phases investigated included pure water and varying concentrations (0.00001 to 0.1 M) of aqueous ammonium acetate and ammonium sulfate. Negative ion mass spectra were obtained for seven di- and two tetra-sulfonated azo dyes with as little as 100 nanograms of sample injected into a pure water mobile phase. Singly and doubly charged negative ions corresponding to losses of one and two sodium atoms were generally observed. Results indicate that protonation by ammonium acetate begins to occur at concentrations between 0.001 and 2.5 x 0.001 M. At concentrations higher than 0.01 M there is suppression of the response. These results mean that anion evaporation of the analyte directly from the droplet is the major ionization process operating under these conditions and there is no significant chemical ionization contribution. The suppression of ionization at higher salt concentrations is due to the injection of the more volatile salt anion (relative to the dye) before the field strength is sufficient to eject dye anions from the evaporating droplets. (Copyright (c) Hayden + Son Limited 1987.)
Supplementary Notes Pub. in Rapid Communications in Mass Spectrometry, v1 n3 p48-50 Jul 87. Sponsored by Environmental Monitoring Systems Lab., Las Vegas, NV.
NTIS Title Notes Journal article.
Title Annotations Reprint: Environmental Applications of Thermospray LCMS: Qualitative Analysis of Sulfonated Azo Dyes.
PUB Date Free Form c1987
Category Codes 99A; 68D
NTIS Prices PC A02/MF A01
Primary Description 600/07
Document Type NT
Cataloging Source NTIS/MT
Control Number 814617134
Origin NTIS
Type CAT