A procedure to determine the presence of nano- or micro- TiO2 particles in commercial cosmetic formulations, which may have a daily use, is proposed. Two identification techniques the Square Wave Voltammetry (SWV) and ICP-AES were employed to determine the amount of TiO2 in six foundation creams sold in Italy and USA. A new SWV method, based on an acidic microwave-assisted digestion of the sample, has been set up and the results were compared and critically commented with those obtained by the established ICP-AES method. The analytical procedure was verified by analyzing the P-25 Degussa sample. The sizes of the particles contained in the foundations were investigated through Sedimentation (SdFFF) and Flow Field-Flow Fractionation (FlFFF) by analyzing aqueous slurries obtained from the foundation through a solvent extraction procedure. The FFF techniques sinergically coupled with the ICP-AES allowed to assess the sizes of the TiO2 particles. The content of the extracted slurries was also checked by TEM observations.

TiO2 nano- and micro-particles in commercial foundation creams: Field Flow-Fractionation techniques together with ICP-AES and SQW Voltammetry for their characterization

CONTADO, Catia;PAGNONI, Antonella
2010

Abstract

A procedure to determine the presence of nano- or micro- TiO2 particles in commercial cosmetic formulations, which may have a daily use, is proposed. Two identification techniques the Square Wave Voltammetry (SWV) and ICP-AES were employed to determine the amount of TiO2 in six foundation creams sold in Italy and USA. A new SWV method, based on an acidic microwave-assisted digestion of the sample, has been set up and the results were compared and critically commented with those obtained by the established ICP-AES method. The analytical procedure was verified by analyzing the P-25 Degussa sample. The sizes of the particles contained in the foundations were investigated through Sedimentation (SdFFF) and Flow Field-Flow Fractionation (FlFFF) by analyzing aqueous slurries obtained from the foundation through a solvent extraction procedure. The FFF techniques sinergically coupled with the ICP-AES allowed to assess the sizes of the TiO2 particles. The content of the extracted slurries was also checked by TEM observations.
2010
Contado, Catia; Pagnoni, Antonella
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1395624
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