Abstract
A study was performed for the determination of lead in rice grains directly by solid sampling high resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS) without digesting sample. The effects of sample amount, pyrolysis/atomization temperatures on the determination of lead in rice were investigated and optimized using a certificated rice flour. The lead concentrations were determined applying 800°C of pyrolysis and 1800°C of atomization temperatures without modifier. LOD (N=10, 3σ) and characteristic mass were 2.3μgkg−1 and 8.1pg, respectively. The certified lead value of a rice flour CRM was found in its uncertainity limits. The lead contents of various rice samples obtained from markets in Turkey were between 0.009 and 0.162mgkg−1 which are in acceptable range. The average lead concentrations in various rice grains taken from the same package were significantly different from each other.
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