Correction for Spectral Interference with Determination of Lead in Blood by Non-Flame Atomic Absorption Spectrometry

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Abstract
A non-flame atomizer incorporating a graphite tube and cup is used to determine lead in whole blood and packed erythrocytes. In a direct method, a 2-µl sample is treated in situ in the cup with 1 µl of concentrated nitric acid. The oxidized sample can then be dried, ashed, and atomized without leaving a residue. The nitric acid treatment obviates correction for nonselective absorption, something previously necessary in the determination of lead in blood by non-flame techniques. The resulting chemical conversion of the matrix compounds frees the lead atomic absorption peak from the spectral interference. Alternatively, a 50-µl sample of blood or erythrocytes is treated with 50 µl of concentrated nitric acid and a 1.5-µl aliquot is analyzed with use of the graphite tube.

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