Metal oxide interferences on lead analysis in tungsten filament atomic absorption spectrometry.

Abstract

Several interferences that decrease lead (Pb) absorbance were investigated using a lab.-built tungsten filament electrothermal atomizer. The study focused on interferences relevant to the anal. of Pb in physiol. samples. Raman microscopy was used to track the formation of metal oxides in situ during the drying and pyrolysis stages of anal. Metal oxide formation was correlated to the temp. of each step and subsequent nonspecific spectral interference during atomization. Rhenium was studied as a permanent modifier for the anal. of Pb-contg. samples. Atomic absorption results showing the effectiveness of rhenium for reducing interferences from org. matrix components will be presented. [on SciFinder(R)]