Spectral interferences associated with a direct current plasma combined with a 20-element, direct reading echelle spectrometer have been characterized. The results indicate that molecular emission interferences due to entrained air are generally negligible, but the presence of high
carbon concentrations may cause problems for two elements. Spectral interferences due to the presence of high concentrations (500 mg/l) of Ca, K, Mg, and Na were also studied. No problems were noted for Na or K while an interference due to atomic emission of Mg was observed. Calcium was responsible
for stray light interferences due to near scatter and to reflections occurring in the secondary optics. The latter were eliminated by masking techniques and the former were compensated for via the use of a simple procedure. Overall, the spectral interferences encountered appear to be less
severe than those reported for an inductively coupled plasma-direct reading spectrometer system.
Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523 2:
Water Resources Division, U.S. Geological Survey, 5293 Ward Road, Denver, Colorado 80002
Publication date: September 1, 1979
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