Abstract
Although ICP mass spectrometry offers a powerful multi element analytical method, the background spectra often interfere with the determination. The detectability for halogens is not adequate because of insufficient ionization. In the present work, a low-pressure helium ICP was studied in order to overcome these problems. A plasma was sustained with a water-cooled torch at 400 800 W forward power with a maximum signal intensity at 500 W. The optimal plasma gas-flow rate and sampling depth were 40 ml min-1 and 17 mm, respectively. The signal intensities of 127I+ were much higher than those of the conventional atmospheric-pressure Ar ICP. Background species (ArN+ and Ar2+) were not observed, which may allow the determination of traces of Se (as 80Se+) as well.
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