Objective To establish a method for synchronous determination of arsenic (As) and bismuth (Bi) in cosmetics using dry digestion and atomic fluorescence spectrometry (AFS).
Methods The cosmetics samples were pre-treated with ashing auxiliaries by dry digestion, then pre-reducers were added in the samples, and instrument conditions were optimized. The influence of interfering ions on determination results was evaluated. The results of synchronous determination and separate determinations of As and (or) Bi in cosmetics by hydride generator atomic fluorescence spectrometry were compared.
Results The linear calibration curve for As was within the range of 0.26-10.00 μg/L, with a correlation coefficient (γ) of 0.999 7, and that for Bi was 0.25-10.00 μg/L, with γ=0.999 7. The detection limits were 0.50 μg/L for both As and Bi. The recovery rates for As and Bi were in the range of 92.2%-105.0% and 94.0%-107.0%, respectively. The relative standard deviations (RSDs) were 2.47%-5.07% for As and 2.86%-5.11% for Bi. No significant differences were seen between the results by simultaneous determination and individual determination.
Conclusion The method is simple, precise, and accurate enough for the synchronous determination of As and Bi in cosmetics. It also produces less pollution and requires less manual control by operators.
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