Abstract
Abstract Two studies have been conducted on the analysis of apples for lead by atomic absorption spectrophotometry using the official first action method, 25.B01–25.B05. Sixteen laboratories participated in each study. Recoveries ranged from 92.6 to 110% (101.6% average) in the first study. A second study, in which procedural modifications were made, showed recoveries ranging from 91.2 to 109.7%, with an average of 100.0%. Coefficients of variation for the first and second studies were 5.19 and 4.94%, respectively. On the basis of the second study, procedural modifications have been incorporated into the 12th Edition of Official Methods of Analysis.
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