A FACILE ACIDIC DIGESTION METHOD FOR COSMETIC LEAD AND CADMIUM DETERMINATION BY AN INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETER
Abstract
A method for determining lead (Pb) and cadmium (Cd) in cosmetic products by an inductively coupled plasma atomic emission spectrometer (ICP-AES) is described. The acid digestion approach using concentrated HNO3, HNO3-HClO4, and aqua regia is performed, and the results show that the digestion of HNO3 is the most suitable procedure for cosmetics. The proposed method is then validated and optimized for Pb and Cd determination in terms of accuracy, repeatability, and day-to-day reproducibility. For diluted cosmetic samples, the limits of detection for Pb and Cd are 0.07 and 0.001 µg/g, respectively. This developed method is then successfully applied to the analysis of different facial cosmetic products, showing the contents of Pb and Cd within the ranges ~0.31-0.54 and ~0.01-0.24 mg/kg, respectively. The determination recoveries for Pb and Cd are within 89.7-104.4%, and the relative standard deviations are less than 3.0% (n = 5), showing the good applicability of this proposed method for Pb and Cd quantification in cosmetic samples.
About the Authors
X. . Tan
College of Earth Sciences and Land Resources, Chang’an University
Russian Federation
Russian Federation
Z. -M. Wang
College of Earth Sciences and Land Resources, Chang’an University
Russian Federation
Russian Federation
Z. -L. Wang
Motic (Xiamen) Electric Group Co. Ltd
Russian Federation
Russian Federation
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Review
For citations:
Tan X., Wang Z.-., Wang Z.-. A FACILE ACIDIC DIGESTION METHOD FOR COSMETIC LEAD AND CADMIUM DETERMINATION BY AN INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETER. Zhurnal Prikladnoii Spektroskopii. 2018;85(4):606-611. (In Russ.)
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