The Delves [Analyst (London) 95, 431 (1970)] cup atomic absorption procedure for determination of lead in blood has been studied in detail and modified to permit the direct use of aqueous standards. Precision has been improved by stabilizing the burner mount. The small nonspecific absorption is caused by molecular sodium chloride and potassium chloride, and can be compensated for by including sodium chloride in the aqueous standards. If the cups are pre-coated with albumin, aqueous standards can be used and the more complicated method of additions is obviated. A similar technique was used to examine the analysis of lead in urine.
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Olsen et al. (1972) studied this question.