Atomic absorption and fluorescence spectroscopy with a carbon filament atom reservoir: Part VI. a study of some matrix effects

Abstract

A study is made of the effects of 62 ions present in 1000-fold amounts on the determination of 10 −9–l0 −11g amounts of Ag, Bi, Cd, Cu, Hg, Mg, Pb, Tl and Zn by atomic fluorescence spectroscopy with a carbon filament in an argon atmosphere, with high-intensity hollow-cathode lamps or electrodeless discharge lamps as sources of excitation. Suppressions of signal which occur are shown to be due to gas-phase interaction between the atomic species concerned and the cloud of condensing elements. Re-investigation of these matrix effects by atomic absorption with the filament cell and a limited area viewing technique shows that most of the interferences can be avoided if only the space extending 0.5 mm upward from the filament is illuminated.