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ENHANCED SENSITIVITY IN LIQUID CHROMATOGRAPHY/THERMOSPRAY MASS SPECTROMETRY OF DYES USING A WIRE REPELLER
Citation:
Yinon, J., Tammy L. Jones, AND L. Betowski. ENHANCED SENSITIVITY IN LIQUID CHROMATOGRAPHY/THERMOSPRAY MASS SPECTROMETRY OF DYES USING A WIRE REPELLER. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/029.
Description:
The need for more sensitive methods of detection for the analysis of dyes has led to the investigation of the use of a repeller in the thermospray ionization source of a liquid chronatography/mass spectroFletry instrument. he repeller is actually a wire situated opposite the extraction cone of the ion source and is operated at a voltage of 200-250 V. n increased sensitivity of atout two orders of magnitude is reported for Disperse Blue 79, a widely used azo dye. n increase in the relative intensity of the molecular ion versus the fragment ions is also otserved. t is believed that the narrow electric field produced between the wire repeller and extraction cone accelerates the ions towards the hole of the cone and thus increases the number of ions entering the analyzer.