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

Autor(es)

Rossi Salamanca-Neto, Carlos Alberto ^[1] ; Scremin, Jessica ^[1] ; Fatibello-Filho, Orlando ^[2] ; Clausen, Debora Nobile ^[1] ; Sartori, Elen Romao ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Londrina, Ctr Ciencias Exatas, Dept Quim, Rodovia Celso Garcia Cid, PR-445 Km 380, CP 10-011, BR-86057970 Londrina, PR - Brazil

^[2] Univ Fed Sao Carlos UFSCar, Ctr Ciencias Exatas & Tecnol, Rodovia Washington Luis, SP 310 Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANALYST; v. 143, n. 15, p. 3600-3606, AUG 7 2018.
• Citações Web of Science: 1

Resumo

In this paper, an alternative voltammetric method for the determination of elemental sulphur in cosmetic products is presented. It is based on the decrease of triphenylphosphine oxidation current in the presence of elemental sulphur 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 a supporting electrolyte. The experimental conditions for indirect determination of elemental sulphur were established. Using square-wave voltammetry, the analytical curve was linear in the elemental sulphur concentration range of 9.94-271 mol L-1, with a detection limit of 2.59 mol L-1. The method was successfully applied to determine elemental sulphur 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 with a titrimetric one, at a 95% confidence level. Additionally, excellent recovery percentages were obtained, proving no matrix interferences. (AU)

• Processo FAPESP: 09/14454-8 - Eletrodos de carbono modificados com nanotubos de carbono e/ou nanopartículas metálicas em filmes de quitosana para a determinação de compostos de enxofre em derivados de petróleo e alimentos
• Beneficiário: Elen Julciléia Romão Sartori
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado