Optimization of Heating Programs of Gfaas for the Determination of Cd, Cu, Ni and Pb in Sediments Using Sequential Extraction Technique

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Abstract
The volatilization behaviors of Cd, Cu, Ni and Pb in different extracting media have been studied using graphite furnace atomic absorption spectrometry (GFAAS) to determine metal concentrations in natural sediments. Considerable interference was found for Cd, Ni, and Pb in the extracts of high matrix concentrations, and could be largely reduced by carefully selecting the ashing and atomization temperatures of GFAAS. Optimal heating programs are proposed to suit a variety of extracts containing different matrices.