Evaluation and Expression of Uncertainty in the Determination of Alumina in Deodorants Using Complexometric Method

Recent studies reveal that aluminum has several adverse effects on human life and causes several diseases. There are various sources by which aluminum call enter into a human body: The deodorant is one of them, In this paper, the concentration of alumina (%Al2O3) has been assessed for three different deodorants (namely, A, B, and C) using all indirect complexometric method along with all uncertainty budget. The uncertainty in the measurement has been evaluated and expressed according to the requirements of the standard ISO/IEC 17025:2005. It has been identified that the uncertainty in the measurement arises mainly from repeatability, standardization of zinc acetate, and volume measurement, which have been evaluated and combined according to the EURACHEM guidelines. The concentrations of alumina were 0.81 +/- 0.01, 0.73 +/- 0.01, and 0.49 +/- 0.01 g per 100 mL, respectively, for A, B, and C deodorants. The uncertainty in the measurement varies from 1.2 % to 2 % for the three deodorants. The results show that a person using A and B brand deodorants receives, respectively, 65 % and 48 % higher exposure to aluminum on the skin than a person using the C brand.