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| Format: | Artículo científico |
| Language: | en |
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Universidade Estadual Paulista Júlio de Mesquita Filho
2017
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| Online Access: | https://www.redalyc.org/articulo.oa?id=42955131001 https://www.redalyc.org/journal/429/42955131001/ https://www.redalyc.org/journal/429/42955131001/html/ https://www.redalyc.org/journal/429/42955131001/42955131001.epub https://www.redalyc.org/journal/429/42955131001/movil |
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Table of Contents:
- Optimization of a homogeneous ternary solvent system for the quantification of lead in crystal sugar samples Júnior Olair Chagas Silviana Côrrea Isabela Cristina Silva Melo Fabiana Aparecida Lobo Alex Magalhães de Almeida Química Lead Lead Lead Lead Lead 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 kg1 . 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. 2017 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42955131001 https://www.redalyc.org/journal/429/42955131001/ https://www.redalyc.org/journal/429/42955131001/html/ https://www.redalyc.org/journal/429/42955131001/42955131001.epub https://www.redalyc.org/journal/429/42955131001/movil en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Vol.42