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Experimental design for metals extraction from facial cosmetic samples and determination by square wave voltammetry

Abstract

An alternative microwave-assisted sample preparation procedure is proposed for the rapid, reliable and easy extraction of metals from facial cosmetic samples (lipstick, compact powder and eye shadow). The mass of the sample and the nitric acid and hydrochloric acid volumes were optimised taking into account a 33 Box-Behnken design and factorial 32 with a triplicate central point. The determination of the metals (copper, lead and zinc) by square wave voltammetry (SWV) was investigated, with the electrochemical system consisting of a cell with three electrodes and hydrochloric acid, acetate buffer (pH=4.7) as the supporting electrolytes. The extraction with microwave presented a lower relative standard deviation and greater efficiency in the extraction process, since they obtained higher percentages of recovery. A quantitative analysis was carried out by the method of standard additions. Good linearity was obtained in the range of the concentrations examined. Detection limits of 0.10, 0.05 and 0.22 µg g-1 were found for copper, lead and zinc, respectively, in the facial cosmetic samples. The average values found for the nine samples analysed were in the range of 14.0–26.7 µg g-1 for copper, 1.3–9.7 µg g-1 for lead and 7.1–42064 µg g-1 for zinc. The facial cosmetic samples were also analysed by flame and graphite furnace atomic absorption spectrometry (F AAS and GF AAS), demonstrating an excellent correlation between the results.

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Publication details

The article was received on 30 Jul 2018, accepted on 11 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8AY01696H
Citation: Anal. Methods, 2018, Accepted Manuscript
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    Experimental design for metals extraction from facial cosmetic samples and determination by square wave voltammetry

    L. Faria, T. Lisboa, G. S. de Carvalho, R. A. De Sousa, M. A. C. Matos and R. Matos, Anal. Methods, 2018, Accepted Manuscript , DOI: 10.1039/C8AY01696H

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