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Título: | Optimization of a homogeneous ternary solvent system for the quantification of lead in crystal sugar samples. |
Autor(es): | Chagas, Júnior Olair Corrêa, Silviana Melo, Isabela Cristina Silva Lobo, Fabiana Aparecida Almeida, Alex Magalhães de |
Palavras-chave: | Lead Quantification Cristal sugar Homogeneous ternary system |
Data do documento: | 2017 |
Referência: | CHAGAS, J. O. et al. Optimization of a homogeneous ternary solvent system for the quantification of lead in crystal sugar samples. Eclética Química Journal, v. 42, p. 65-70, 2017. Disponível em: <http://revista.iq.unesp.br/ojs/index.php/ecletica/article/view/37>. Acesso em: 05 abr. 2018. |
Resumo: | During sugar production, contamination of the sugar by potentially toxic metals may occur. Therefore, it is necessary to develop methods to quantify these contaminants. Analytical method for monitoring of lead in sugar samples was developed with the use of homogeneous ternary system of solvents and UV-Vis spectrophotometry. Ternary system was optimized using multivariate experiments and the best condition was: 10% water, 80% ethanol and 10% methyl isobutyl ketone. As the complexing agent, monosodium 4-(2-pyridylazo) resorcinol used. Calibration curve was linear from 0.64 to 5.00 mg L-1, ABS = 0.0873 [Pb2 +] - 0.0032 and R² = 0.9988. The limit of quantification was 0.53 mg L-1 and limit of detection was 0.45 mg L-1 with 95% confidence level, the standard addition curve was linear, ABS = 0.0736 [Pb2+] + 0.0846 And R² = 0.9971. Three samples were analyzed in triplicate and the concentration of lead obtained ranged from 84.74 ± 3.70 mg kg-1; 69.93 ± 11.84 mg kg-1 and 76.45 ± 7.12 mg kg-1. For the standard addition curve, the concentration found was approximately 230.00 mg kg-1. Considering the Brazilian standard, the lead concentration should not exceed 2.00 mg kg-1, thus, it’s concluded that the values obtained were not within the norm for this metal. |
URI: | http://www.repositorio.ufop.br/handle/123456789/9954 |
ISSN: | 19839278 |
Licença: | Todo o conteúdo do periódico Eclética Química, exceto onde identificado, está licenciado sob uma licença Creative Commons 4.0 que permite copiar, distribuir e transmitir o trabalho em qualquer suporte ou formato desde que sejam citados o autor e o licenciante. Fonte: Eclética Química <http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-4670&lng=en&nrm=iso>. Acesso em: 07 nov. 2016 |
Aparece nas coleções: | DEQUI - Artigos publicados em periódicos |
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Arquivo | Descrição | Tamanho | Formato | |
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ARTIGO_OptimizationHomogeneousTernary.pdf | 342,25 kB | Adobe PDF | Visualizar/Abrir |
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