DETERMINATION OF TRACE AMOUNTS OF COBALT BY SOLVENT-EXTRACTION 2ND DERIVATIVE SPECTROPHOTOMETRY

Citation
Mi. Toral et al., DETERMINATION OF TRACE AMOUNTS OF COBALT BY SOLVENT-EXTRACTION 2ND DERIVATIVE SPECTROPHOTOMETRY, Talanta, 40(9), 1993, pp. 1405-1409
Citations number
21
Journal title
Talanta
ISSN journal
00399140 → ACNP
Volume
40
Issue
9
Year of publication
1993
Pages
1405 - 1409
Database
ISI
SICI code
0039-9140(1993)40:9<1405:DOTAOC>2.0.ZU;2-#
Abstract
A sensitive derivative spectrophotometric method is described for the determination of microamounts of cobalt based on the integration of li quid-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 rang e 7.2-500 ng/ml. The method has a high selectivity with a detection li mit of 2.2 ng/ml. The relative standard deviations were 3.2 and 1.5% f or 20 and 100 ng/ml cobalt, respectively. The proposed method was appl ied to the determination of the analyte in vitamins.