Direct analysis of solid samples by graphite furnace atomic absorption spectrometry with a transversely heated graphite atomizer and D2-background correction system (SS GF-AAS) |
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Authors: | R Nowka and H Müller |
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Institution: | (1) Martin-Luther-Universit?t Halle Wittenberg, Fachbereich Chemie, Institut für Analytik und Umweltchemie, Geusaer Strasse 88, D-06217 Merseburg, Germany, DE |
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Abstract: | An instrumental design for the analysis of heavy metals in solid samples (certified reference materials, river sediments,
cements) by direct graphite furnace atomic absorption spectroscopy (SSGF-AAS) is presented and outlined. A high performance
atomic absorption spectrometer with a D2-background corrector and a transversely heated graphite atomizer was modified. Solid sampling was achieved by a mechanical
module combined with an ultra microbalance. Cadmium, lead and chromium in different samples (sample weights between 20–400
μg) have been determined in the μg/g- to ng/g-range with the graphite-platform technique. Different ways of calibration and
inhomogeneity problems are discussed. The precision of SSGF-AAS is equal to the precision of the conventional AAS-technique
with chemical digestion (microwave digestion system, Zeeman-AAS). It is shown that SSGF-AAS is a reasonable alternative to
the conventional technique for selected analytical problems.
Received: 19 February 1997 / Revised: 30 May 1997 / Accepted: 4 June 1997 |
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