Abstract
The determination of cadmium in different samples such as coal fly ashes, soils and sediments by Graphite Furnace Atomic Absorption Spectrometry (GFAAS) was studied. The best analytical conditions and instrumental parameters were deduced. Different types of matrix modifiers were tested and an optimization of several conditions (pyrolysis and atomization temperatures, heating rate, use of L’vov platform, etc.) was carried out. A mixture of 2% NH4H2PO4 + 0.4% Mg(NO3)2 in 0.5 mol L–1 HNO3 as matrix modifier provided the highest sensitivity and an efficient behaviour for the three types of samples. A detection limit of 26 ng g–1 was achieved and other figures of merit are shown. Analytical results obtained by direct calibration using standard samples prepared in the laboratory and by standard addition method were comparable.
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