Abstract
A new type of graphite furnace atomizer — the graphite paper atomizer (GPA) — is described. The tube dimensions are large: l=92 mm, i.d.=9 mm. Analytical determinations of hydride forming traces were carried out in the absence and in the presence of hydride forming matrices using both a normal quartz tube atomizer (QTA) and the new GPA. The analyticalk results for pure solutions of the traces are the same for both atomizers. In the presence of hydride forming matrices the GPA gave improvements of 1 to 3 orders of magnitude for GPA. Chemical matrix modifications were employed to reduce matrix interferences of Se, Te (with Cu2+ ions) and Bi (with EDTA). It was possible to explain the types of interference by hydride forming elements. Thermodynamic calculations were made of the equilibrium composition in hydride vapours. The influence of temperature and hydrogen on the atomization in both atomizers has been studied. The AsSb molecule could be detected spectroscopically in appropriate hydride vapours.
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