Artículos de revistas
Determination of trace amounts of cobalt by solvent extraction-second derivative spectrophotometry
Fecha
1993Registro en:
Talanta, Volumen 40, Issue 9, 2018, Pages 1405-1409
00399140
10.1016/0039-9140(93)80218-G
Autor
Toral Ponce, María
Richter Duk, Pablo
Silva, Lorena
Institución
Resumen
A sensitive derivative spectrophotometric method is described for the determination of microamounts of cobalt based on the integration of liquid-liquid separation and reaction, in dichloroethane, of the analyte with 3-(4-phenyl-2-pyridinyl)-5-phenyl-1,2,4-triazine (PPT) and 2,4,6-trinitro-phenol (picric acid). Cobalt was thus determined in the range 7.2-500 ng/ml. The method has a high selectivity with a detection limit of 2.2 ng/ml. The relative standard deviations were 3.2 and 1.5% for 20 and 100 ng/ml cobalt, respectively. The proposed method was applied to the determination of the analyte in vitamins. © 1993.