Direct determination of copper and lead in sewage sludge by solid sampling-graphite furnace atomic absorption spectrometry — study of the interference reduction in the gaseous phase working in non-stop flow conditions

摘要: Abstract Graphite furnace atomic absorption spectrometry is most useful for the determination of metals in solid samples when with a slow or complicated dissolution process are used. Its application to inorganic matrixes (especially geological material), therefore, appears be field great interest. However, papers published date deal organic samples. In present paper two different strategies direct proposed depending on relationship between analyte atomization temperature and vaporization matrix. For more case where both temperatures similar, working non-stop flow conditions because it permits considerable reduction interferences gas phase. This way lead copper sewage sludge sample was carried out. The results can considered as satisfactory regard accuracy precision (R.S.D. 7.8% 5.7%, Pb Cu, respectively), they similar previous ones obtained mainly less problematic