Determinação de chumbo em batons e tinturas capilares por espectrometria de absorção atômica

Abstract

The use of cosmetics is growing, like this, it is important to ensure the quality and use with the safety of these products. For this, chemical analysis of contaminants, such as lead (Pb), is of paramount importance. Pb has a characteristic of bioaccumulation and high levels of this metal in the human body can have detrimental health effects. With this, in the present study, an analytical methodology was developed, using the flame atomic absorption spectrometry (FAAS) technique, for determination of Pb in lipsticks and hair dyes. The samples were submitted to wet decomposition in a digester block, with HNO 3 as the oxidant agent. After preparation of the samples the Pb was determined using the proposed methodology and it was verified that due to the low sensitivity of the technique, it was not possible to quantify the element in the majority of the samples. Therefore, it was necessary to use the graphite furnace absorption spectrometry technique (GFAAS) for the analysis of the samples. It has a better sensitivity when compared to FAAS, since the sample is atomized in a short period and the average residence time of the atoms in the optical path is higher, about one second or more allowing analysis in a working range in the order of μg.L -1 presenting as a better alternative for determination of Pb in lipsticks and hair dyes. The Pb content found in the samples was low, presenting no health risk for adults and children.