Evaluación de métodos analíticos para la determinación de metales pesados en cosméticos

Abstract

The present research work present the advantages of the diverse methods used to determine the concentration of heavy metals in cosmetics, principally lipstick and eyeshadow, with the application of atomic absoprtion spectrophotometry instrumental analysis technique. Presenting the principal advantage of the methods, quality of the analytic results, and others. 38 methods from different sources were recovered, between which were found SCielo, Elsevier and the repositories of different universities. The analysis were carried out by categories, these referred to the source they were recovered, the metal the method analyzed, the cosmetic kind analyzed, the pretreatment which the sample was submitted, the calibration of the equipment and the statistic parameter with which the quality of the analytic results were referenced. Within the 38 methods, it was found that 14 were validated. Some of the methods didn't had enough statistics parameters to stablish if the method is reliable, the parameters considered to give methods reliability were the limit of detection, standard deviation, relative standard deviation. The obtained results were analyzed to establish the better method taking on account various considerations, concluding that the method 25 is the best one, given to the multiple advantages over the other ones, besides, it is also validated. This method is used to determine lead, cadmium and other heavy metals from lip cosmetics and compact powder, using the acid digestion method with the addition of HNO3 y H2O2