Comparison of several microwave cavities for the simultaneous determination of arsenic, germanium, antimony, and tin by plasma emission spectrometry.
Mulligan-KJ; Hahn-MH; Caruso-JA; Fricke-FL
Anal Chem 1979 Apr; 51(12):1935-1938
Four microwave cavities for the simultaneous determination of arsenic (7440382), germanium (7440564), antimony (7440360), and tin (7440315) by plasma emission spectrometry were compared. Microwave power at 2,450 megahertz (MHz) was provided by a microwave power generator and conducted through cable to the cavity. All cavities were operated at 100 watts (W) forward power and 0 to 0.5 W reflected power. The plasma was maintained throughout the course of the experiment. A Beenakker, 0.75 wavelength Evenson, 0.25 wavelength Evenson, and 0.75 wavelength Broida cavity were successfully used to couple microwave power to an argon-helium or helium plasma at atmospheric pressure. The suitability of each plasma as a spectral excitation source for the simultaneous spectrometric analysis was evaluated. Although detection limits and linear dynamic ranges were similar, the pure helium plasma sustained in the Beenakker cavity was the easiest to tune and operate. It also provided the most reproducible results. The authors note that these results are comparable to those obtained by other methods.
NIOSH-Publication; NIOSH-Grant; Grants-other; Analytical-methods; Microwave-radiation; Atomic-absorption-spectrometry; Chromatographic-analysis; Chemical-reactions
Chemistry University of Cincinnati Department of Chemistry Cincinnati, Ohio 45221
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University of Cincinnati, Cincinnati, Ohio