OTIMIZAÇÃO MULTIVARIADA DE METODOLOGIA PARA DIGESTÃO DE MICROPARTÍCULAS POLIMÉRICAS CARREADORAS DE CÁTIONS METÁLICOS
AUTOR(ES)
Chagas, Júnior O., Sousa, Hércules G. L. de, Cunha, Isabela C. M., Froes-Silva, Roberta E. S., Silva, Gilmare A. da, Lobo, Fabiana A.
FONTE
Quím. Nova
DATA DE PUBLICAÇÃO
2017-01
RESUMO
There are not reports in the literature of digestion processes of metallic cation carrier microparticles. Multivariate experimental designs were utilized to ensure an appropriate digestion for further analysis by atomic absorption spectroscopy. It was used a heater plate and the polimeric degradation was evaluated utilizing an analyzer of total organic carbon (TOC). For the total carbon (TC) content, the full factorial design 24 pointed the significance of sample volume (VAm), in relation to the variables acid volume (VAc), temperature (T) and digestion time (t). However, according to the normal distribution graph it was noted a possible significance of the T and t effects. The same was observed for TOC, including the VAm × VAc × T effect suggestive of complex behavior. In the central composite design all variables were again studied and the VAM was significant, promoting a TC decreasing at the lower evaluated level. By ANOVA a quadratic model without lack of fit was found, with the significant quadratic term. The best digestion condition was: 5.00 mL of sample, 10.00 mL of nitric acid, 60 ºC and 90 min. The multivariate optimization allowed an efficient digestion, with the initial carbon concentration of 4.60 mg L-1 decreased to 0.55 mg L-1.
Documentos Relacionados
- DESENVOLVIMENTO E AVALIAÇÃO DE MICROPARTÍCULAS POLIMÉRICAS CONTENDO RESVERATROL
- Desenvolvimento de sílicas organofuncionalizadas para pré-concentração de cátions metálicos em meio aquoso e etanólico
- Metodologia multivariada para avaliação do risco de crédito de operações bancárias
- Por que otimização multivariada?
- Metodologia para otimização e controle de processos-CAPDCA