Method for the determination of the sun protection factor (physically in sunblocks

摘要

Method for the determination of the sun protection factor (physically in sunblocks.The method described in this invention has as objective to determine the concentration of u00e1xidos metals by X-ray fluorescence by dispersion of energy (EDXRF) in order to obtain the sun protection factor (SPF) due to the physical barrier in the composition of sunblocks, as well as iden Ensuring possible metals present in the samples.For so much was used a portable EDXRF and analyzed 27 commercial samples of different brands and different factors of sun protection of sunblocks. As a result, it was possible to determine the contribution of physical protection in the FPS, associated with the concentration of you, present in some samples of sunblocks found in the market.It was also possible to detect the presence of various metals in sunscreens, such as Fe, Zn, Br and Sr, including identifying chemical elements that were not mentioned in their formulations.