Desenvolvimento de métodos para determinação de cádmio, chumbo e cromo em cosméticos por espectrometria de emissão óptica com plasma induzido por laser

• Ano de defesa: 2014
• Autor(a) principal: Matos, Simone Pires de [UNIFESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo
• Palavras-chave em Português: Optical emission; LIBS; Laser; Toxic elements; Cosmetics; Emissão óptica; Elementos tóxicos; Cosméticos
• Link de acesso: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=1361402; http://repositorio.unifesp.br/handle/11600/47468

Due to the increasing demand for beauty products, many cosmetic products have been marketed with dubious formulations about the safety of consumers' health. In some cases, pigments containing potentially toxic elements such as lead, chromium and cadmium are added in the formulations. Currently, there is a necessity to develop methods that allow the direct determination of these chemical elements in cosmetics. These methods are needed to assist in quality control and risk prevention, both by industry and by official regulators. In this work the optical spectrometry with laser-induced plasma emission was evaluated for determination of Cd, Cr and Pb in cosmetics. This technique, known internationally as Laser Induced Breakdown Spectroscopy with LIBS acronym, is in a consolidation phase, but the results presented in the literature highlight major advances and potential for direct determination of chemical elements in different types of samples. It was evaluated the key factors affecting the performance of LIBS, such as: sample characteristics and the ablation process, variables associated with laser, spectroscopic and matrix interference, and calibration strategies. The analytical calibration curves and the detection limits obtained initially indicate that LIBS can be a future alternative to quality control of these products.