2017
DOI: 10.21577/0100-4042.20170052
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Determinação de enxofre em shampoo por espectrofotometria UV-Vis: avaliação de métodos de preparo de amostras

Abstract: publicado na web em 15/05/2017 DETERMINATION OF SULFUR IN SHAMPOO BY UV-VIS SPECTROPHOTOMETRY: EVALUATION OF SAMPLE PREPARATION METHODS. Dry ashing, dissolution in aqueous medium or wet digestion methods were evaluated for sample preparation of shampoo for the subsequent indirect determination of sulfur by UV-Vis spectrophotometry. Among the sample preparation methods evaluated, microwave-assisted wet digestion using 7 mol L -1 HNO 3 was the most suitable method for this purpose. Accuracy of the proposed metho… Show more

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Cited by 5 publications
(3 citation statements)
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References 16 publications
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“…From an analytical chemistry point of view, hair care products are considered to be complicated matrices containing numerous organic and inorganic compounds, thus requiring extra sample cleanup steps prior to the end-point analysis. Representative recent analytical applications in hair care products are presented in Table 1 [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. As can be seen in the examples of Table 1 , solid- or liquid-phase extraction steps are quite common even when sophisticated LC-MS instrumentation is employed, while dry ashing/wet digestion are necessary for the determination of inorganic analytes.…”
Section: Introductionmentioning
confidence: 99%
“…From an analytical chemistry point of view, hair care products are considered to be complicated matrices containing numerous organic and inorganic compounds, thus requiring extra sample cleanup steps prior to the end-point analysis. Representative recent analytical applications in hair care products are presented in Table 1 [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. As can be seen in the examples of Table 1 , solid- or liquid-phase extraction steps are quite common even when sophisticated LC-MS instrumentation is employed, while dry ashing/wet digestion are necessary for the determination of inorganic analytes.…”
Section: Introductionmentioning
confidence: 99%
“…There are different techniques for obtaining hydroxyapatite, such as wet precipitation method (acid-base reaction) [32], reaction between phosphate salts [33], dry synthesis [34], sol-gel method [35], and hydrothermal method [36]. Wet precipitation method in aqueous solution stands out for its relative simplicity, which has low cost and good reproducibility.…”
Section: Introductionmentioning
confidence: 99%
“…Para eficiência, a cubeta deve ser manuseada com cuidado, pois a gordura natural das mãos do analista pode interferir na leitura, bem como no momento da limpeza, que deve ser feito com água e papel macio para evitar arranhões, que também interferem na leitura. Os resultados desta técnica são a ótima eficácia no diagnóstico de parâmetros químicos específicos, tornando-a altamente imprescindível na reunião de dados (Oliveira e Leite, 2016;Bielemann et al, 2017).…”
Section: Introductionunclassified