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Assessment of the performance of triphenylphosphine for the voltammetric determination of elemental sulphur in cosmetic products

Abstract

In this paper, an alternative voltammetric method for the determination of elemental sulfur in cosmetic products is presented. It is based on decrease of triphenylphosphine oxidation current in the presence of elemental sulfur by using a glassy carbon electrode. A solution of 2% (m/v) acetic acid and 0.6 mol L−1 sodium acetate in methanol was used as supporting electrolyte. The experimental conditions for indirect determination of elemental sulfur was established. Using square-wave voltammetry, the analytical curve was linear in the sulfur concentration range of 9.94 – 271 µmol L−1, with a detection limit of 2.59 µmol L−1. The method was successfully applied to determine elemental sulfur in soap bars and anti-acne cream, without any preliminary sample treatment; therefore, it is shortened and simplified. The results obtained with the indirect voltammetric method were not statistically different in comparison to a titrimetric one, at a 95% confidence level. Additionally, excellent recovery percentages were obtained, proving no matrix interferences.

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Publication details

The article was received on 29 Apr 2018, accepted on 12 Jun 2018 and first published on 12 Jun 2018


Article type: Paper
DOI: 10.1039/C8AN00799C
Citation: Analyst, 2018, Accepted Manuscript
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    Assessment of the performance of triphenylphosphine for the voltammetric determination of elemental sulphur in cosmetic products

    C. A. R. Salamanca-Neto, J. Scremin, O. Fatibello-Filho, D. N. Clausen and E. R. Sartori, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN00799C

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