Abstract
Optimal conditions of hydride atomic absorption spectrophotometry are described for the determination of ultratrace levels of arsenic in urine and whole blood. The arsine is produced from the samples by the addition of a reducing agent, sodium borohydride, and passed to a quartz furnace mounted in the light path of an atomic absorption spectrophotometer. The method will analyze 60 samples an hour with an absolute detection limit of 3.9 ng . The sensitivity is 5.9 ng for producing l % absorption. With the described procedure , the arsenic found in various National Bureau Standard (NBS) Standards was as follows (in ug/g dry material) : tomato leaves, 0.14±0.04 : rice flour, 0.30±0.02 ; pine needles, 0.23±0.02. It indicates this method of analysis is reliable. The normal value for urinary arsenic of 100 healthy adults is 63.4±29.7ug/1 with a range of 9-120ug /1. No significant variety was found between the different sexes. The mean value of 31 blood samples is 13.4±2.9 ng / ml with a range of 5.8-20.5 ng / ml.
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