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The use of the microwave-induced plasma with a new low-flow plasma centering torch has been evaluated. Data were collected through a computer-controlled, background-correcting polychromator system with two versions of the newly developed laminar flow torch. It showed sensitivities slightly
better than the 0.5-mm-i.d. capillary quartz open tube torch. Detection limits were between 8 and 60 pg/s for carbon, hydrogen, bromine, chlorine, and fluorine—a considerably improved performance over the tangential flow torch. Torch lifetime and plasma stability are comparable to or
better than the high-flow tangential flow torch with three-hour and three-day RSDs of 2% and 6%. Centered plasmas may be sustained with flow rates as low as 5 mL/min.
Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221 2:
Department of Aerospace Engineering, University of Cincinnati, Cincinnati, Ohio 45221
Publication date: November 1, 1985
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)