THERMOSPRAY ENHANCED INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION-SPECTROSCOPY DETECTION FOR LIQUID-CHROMATOGRAPHY

Thermospray sample Introduction Is studied as an interface between liquid chromatography and Inductively coupled plasma atomic emission spectrometry for metal speciation studies. Detection llmits for chromium species separated by Ion chromatography or mobile phase ion-pairing chromatography are Improved by factors of 24 and 36, respectively, for 50 and 25 μm aperture based thermospray systems, as compared to pneumatic sample Introduction. For arsenic species separated by Ion chromatography, relative response factors between the two sample introduction systems were species dependent. Lower enhancements for certain species with thermospray were thought to result from thermal decomposition to form volatile species which were lost during desolvation. For nonaqueous size exclusion studies of organoiron species, detection limits were Improved by a factor of about 50 with thermospray compared to a pneumatic sample introduction system. © 1990, American Chemical Society. All rights reserved.