Publicação: Rapid determination of lead in progressive hair dye lotion by spot test/diffuse reflectance spectroscopy with a paper platform
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A simple, inexpensive, and clean methodology employing a combined spot test/diffuse reflectance spectroscopy procedure was developed and applied for the quality control analysis of lead in hair dyes, using a filter paper platform. The method is based on the complexation reaction of lead, present in a pH 2.8 buffer medium containing tartaric acid and sodium and potassium tartrate, with sodium rhodizonate (ROD) in an aqueous medium containing sodium dodecyl sulfate (SDS) surfactant, yielding a colored compound on the surface of a filter paper. The concentrations of ROD and SDS were optimized using experimental design. The linear range obtained for reflectometric measurements carried out at 545 nm was 4.70-140 mg L<sup>-1</sup> of lead (R = 0.998), and the limits of detection and quantification were 1.12 and 3.75 mg L<sup>-1</sup> , respectively. The proposed method was successfully applied to the analysis of lead in progressive hair dyes.
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Diffuse reflectance spectroscopy, Lead, Progressive hair dye, Spot test
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Inglês
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Journal of the Brazilian Chemical Society, v. 26, n. 10, p. 2137-2143, 2015.
