Evaluation on the Uncertainty of Lead Analysis in Cosmetics by Flame Atomic Absorption Spectrometry

Objectives In order to have a more objective and accurate result, the uncertainty of lead content in cosmetics detected by Flame Atomic Absorption Spectrometry(FAAS) was evaluated.

Methods Based on the theory of evaluating uncertainty, the sources of uncertainty in the whole testing process were analyzed and calculated.

Results The main sources of uncertainty from detecting lead in samples were the combination of fitting the working curve, determining the concentration of solution for preprocessing samples and the determination of recoveries, while the influence from other factors was less, such as weighing and making constant volume of sample, the preparation of standard solution, and repeated measurement.

Conclusion The expanded uncertainty of lead content in cosmetics determined by Flame Atomic Absorption Spectrometry (FAAS) was 7.06%.