| Revista: | Quimica nova |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000199214 |
| ISSN: | 0100-4042 |
| Autores: | Pereira-Filho, Edenir R1 Poppi, Ronei J Arruda, Marco A.Z |
| Instituciones: | 1Universidade Estadual de Campinas, Instituto de Quimica, Campinas, Sao Paulo. Brasil |
| Año: | 2002 |
| Periodo: | Mar-Abr |
| Volumen: | 25 |
| Número: | 2 |
| Paginación: | 246-253 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, descriptivo |
| Resumen en inglés | This work describes a factorial design for the optimization of pyrolysis and atomization temperatures in ETAAS. As examples, Cd and Pb were determined using lower pyrolysis and atomization temperatures and Al and Mo with higher pyrolysis and atomization temperatures. Good results were obtained for Cd employing Rh (mo = 1.4 pg) as a permanent modifier with pyrolysis and atomization temperatures of 640 and 1500 °C, respectively. For Zr, W or Zr+W, the Cd pyrolysis and atomization temperatures were 500 and 1500 °C, respectively, with mo = 1.4 pg using Zr or W and 1.5 pg using Zr+W. The best results for Pb were those using Rh, Zr, W and Zr+Rh, obtaining characteristic masses of 42, 37, 34 and 36 pg, respectively. Pyrolysis and atomization temperatures of 910 and 1850 °C, respectively, were achieved for this metal. For Al, the best results were obtained when Zr or Zr+W were used. Mo was also tested as a possible permanent modifier for Al, but the results were not satisfactory. The results obtained for Mo without modifier were similar to those with conventional modifiers (Mg or Pd+Mg) and the results obtained using permanent chemical modifiers were not satisfactory. In all situations, the experiments were performed faster than those using the univariate procedure |
| Disciplinas: | Química |
| Palabras clave: | Fisicoquímica y química teórica, Química analítica, Química inorgánica, Diseño factorial, Metales, Pirólisis, Atomización, Temperatura, Aluminio, Cadmio, Molibdeno, Plomo |
| Keyword: | Chemistry, Analytical chemistry, Inorganic chemistry, Physical and theoretical chemistry, Factorial analysis, Metals, Atomization, Temperature, Aluminum, Cadmium, Molybdenum, Lead, Pyrolysis |
| Texto completo: | Texto completo (Ver HTML) |
