Abstract
A method for the determination of lead in serum by graphite furnace atomic absorption spectrometry with the standard type graphite tube using chromium nitrate as a matrix modifier is described. Serum is used without complicated sample pretreatment but with dilution by 1% Triton X-100 of 0.1 mol/l nitric acid solution containing 2000 mgCr/l. Detection limit (S/N=3) was 0.22 μg/l in serum. Reproducibility (RSD) of 4% at n=10 was observed. Recovery of lead in a certified reference material, bovine blood was 104%. The average sensitivity for five different serum samples was 0.00304 abs per μg/l (RSD : 4%). Lead level in 1.3 μg/l of serum was observed in twenty sera of normal subjects.
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