Abstract
Sensitivity is compared for a number of elements in tubes for electrothermal atomic absorption spectrometry made from pyrolytic graphite coated and uncoated polycrystalline electrographite and from glassy carbon. The best atomization efficiency is always obtained in a pyrolytic graphite coated tube, independent of the volatility of the element and the atomization mechanism involved. The pronounced sticking properties of metal atoms to active sites of uncoated polycrystalline electrographite and glassy carbon are believed to be responsible to this behavior. This theory is supported by the observed shifts in peak maxima, peak broadening, and the higher atomization temperatures that have to be applied in these tubes. For elements forming stable carbides, these effects can be enhanced by chemical reactions with the tube material.
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