| Revista: | Quimica nova |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000198147 |
| ISSN: | 0100-4042 |
| Autores: | Oliveira, Adriana Paiva de1 Freschi, Gian Paulo Giovanni Dakuzaku, Carolina Sinabuero Moraes, Mercedes de Crespi, Marisa Spirandeli Gomes-Neto, Jose Anchieta |
| Instituciones: | 1Universidade Estadual Paulista "Julio de Mesquita Filho", Instituto de Quimica, Araraquara, Sao Paulo. Brasil |
| Año: | 2001 |
| Periodo: | Nov-Dic |
| Volumen: | 24 |
| Número: | 6 |
| Paginación: | 743-747 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental |
| Resumen en inglés | Simultaneous electrolytic deposition is proposed for minimization of Cu2+ and Pb2+ interferences on automated determination of Cd2+ by the Malachite Green-iodide reaction. During electrolysis of sample in a cell with two Pt electrodes and a medium adjusted to 5% (v/v) HNO3 + 0.1% (v/v) H2SO4 + 0.5 mol L-1 NaCl, Cu2+ is deposited as Cu on the cathode, Pb2+ is deposited as PbO2 on the anode while Cd2+ is kept in solution. With 60 s electrolysis time and 0.25 A current, Pb2+ and Cu2+ levels up to 50 and 250 mg L-1 respectively, can be tolerated without interference. With on-line extraction of Cd2+ in anionic resin minicolumn, calibration graph in the 5.00 - 50.0 µg Cd L-1 range is obtained, corresponding to twenty measurements per hour, 0.7 mg Malachite Green and 500 mg KI and 5 mL sample consumed per determination. Results of the determination of Cd in certified reference materials, vegetables and tap water were in agreement with certified values and with those obtained by GFAAS at 95% confidence level. The detection limit is 0.23 µg Cd L-1 and the RSD for typical samples containing 13.0 µg Cd L-1 was 3.85 % (n= 12) |
| Disciplinas: | Química |
| Palabras clave: | Química analítica, Química de alimentos, Cobre, Plomo, Cadmio, Deposición electrolítica, Precipitación, Verde de malaquita, Agua, Alimentos |
| Keyword: | Chemistry, Analytical chemistry, Food chemistry, Copper, Electrolytic deposition, Lead, Precipitation, Malachite green, Water, Foods, Cadmium |
| Texto completo: | Texto completo (Ver HTML) |
