Abstract
The preparation and operation of a dual-element arsenic-antimony microwaveexcited electrodeless discharge tube is described; it can be applied to atomic fluorescence and atomic absorption spectroscopy. The dual source is as stable as the corresponding single-element sources, and the sensitivities in atomic absorption and detection limits in fluorescence are similar to those obtained for individual electrodeless discharge tubes. Interference studies with a selected number of other ions show that there is no extra interference introduced by use of the multi-element source. In addition, bismuth can be determined by direct-line fluorescence at 302.5 nm by spectraloverlap excitation from the 206.163-nm iodine line which is emitted by the As-Sb-I source. Arsenic-cadmium spectral-overlap excitation also permits the fluorimetric or absorptiometric determination of cadmium at 228.802 nm by means of the 228.81-nm arsenic line from the dual-element source; in this case the sensitivities obtained by both techniques are much inferior to those obtained with a cadmium electrodeless discharge tube.
Published Version
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