Spectrophotometric Determination of Trace Amounts of Cobalt and Copper with 3- (2'-Thiazolylazo)- 2,6- Diaminopyridine

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Journal Title, Volume, Page: 
Spectroscopy Letters, Volume 25, Issue 7 November 1992 , pages 1049 - 1055
Year of Publication: 
Basem F. Shraideh
Ali. Z. Abu Zuhri
Mohammad Hannoun
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Preferred Abstract (Original): 

Sensitive methods for the determination of trace amounts of cobalt and copper by complexation with 3-(2'-Thiazolylazo)-2,6- diaminopyridine (2,6-TADAP) are described. Copper forms a 1:2 violet complex with the reagent having a molar absorptivity of 1.00  times 104 L mol-1cm-1, Baer's law is obeyed over the range 0 -50.84 μg in the total volume of 10ml. Cobalt also forms a 1:1 green complex with a molar absorptivity of 1.07 times 104L mol-1cm-1 and obeying Beer's law over the range 0 -23.57 μg in the total volume of 10 ml. The procedure is simple and rapid without any tedious extraction steps for copper and without oxidation of cobalt (II) to cobalt (III).