Spectral interference on the lead 283.3 nm line in Zeeman-effect atomic absorption spectrometry

In Zeeman-effect atomic absorption spectrometry a spectral interference for lead on the 283.3 nm line was observed when solid samples containing high sulfur contents are analysed. From experiments and published data it is evident that this interference is due to molecular absorption by S2 molecules. In real samples, selective vaporization of the sulfur compounds by thermal pre-treatment is not possible with the graphite furnace–platform equipment used. However, with appropriate atomization conditions the interfering signal can be sufficiently separated.