| Revista: | Quimica nova |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000313266 |
| ISSN: | 0100-4042 |
| Autors: | Batistela, Vagner Roberto1 Tessaro, Andre Luiz Soares, Rafael R. da S Souza, Vagner Roberto de Hioka, Noboru |
| Institucions: | 1Universidade Estadual de Maringa, Departamento de Quimica, Maringa, Parana. Brasil |
| Any: | 2006 |
| Període: | Sep |
| Volum: | 29 |
| Número: | 5 |
| Paginació: | 1101-1105 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | The modern stopped-flow reaction analyzer has shown high efficiency and flexibility, which provides outstanding sample economy with a dead-time of less than 1 ms. However the cost of the equipment imposes a serious restriction to many Brazilian scientists and teachers. In this work we describe the construction of a low-cost stopped-flow system coupled to a UV-Vis spectrophotometer. The performance of the system was checked by monitoring the kinetics of two reactions: the fading of phenolphthalein in aqueous alkaline solution and the chlorophyll a demetallation in acid medium. The apparatus showed reasonable efficiency with a dead-time of 0.3 to 0.5 s. The very good results obtained in these two illustrative processes show that the system is satisfactory for determining rate constants with mean reaction times ranging from seconds to minutes |
| Disciplines | Química |
| Paraules clau: | Química analítica, Instrumento de flujo detenido, Cinética química, Reacciones químicas |
| Keyword: | Chemistry, Analytical chemistry, Stopped-flow instrument, Chemical kinetics, Chemical reactions |
| Text complet: | Texto completo (Ver HTML) |
