Abstract
This paper presents an application of atomic absorption spectrophotometry (AAS) to the determination of arsenic in biological materials.The AAS method for arsenic determination is principally based on the chemical conversion of arsenic to arsine and the sweeping of arsine evolved into a burner by means of an argon carrier gas. The effects of various factors on the determination were studied and the application of this technique to human urine and hair is discussed.The following results were obtained : 1) For the determination of arsenic by this method, no serious interference was observed in the presence of 5 μg/ml of Cu, Fe, Sb, Co, Cr, Hg, Mo or Ni, and of 0.01 to 1.0 M of NaCl and KCl. However, the remarkable interference of nitric acid was observed, while this technique was not interfered by 0.01 to 1.0 N of perchloric acid and phosphoric acid.2) The arsenic in urine and hair could easily be determined to the extent of 0.05 μg of arsenic after wet ashing by a mixture of nitric and sulfuric acid.3) The recovery rate of arsenic added to human urine and hair was 92 to 104 percent.4) The interference by the coexisting substances was not observed.5) The results obtained by this method were in close agreement with those by the colorimetric method of Ag-diethyldithiocarbamate.
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