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

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Thu, 2014-03-20 13:05 — Bassem Shraydeh
Journal Title, Volume, Page: 
Spectroscopy Letters: An International Journal for Rapid Communication Volume 25, Issue 7, Pages 1049-1055
Year of Publication: 
1992
Link: 
http://www.tandfonline.com/doi/abs/10.1080/00387019208018214#.UyrPQPmSwgY
Authors: 
Bassem F. Shraydeha
Chemistry Department, Faculty of Science , An-Najah National University , Nablus, Palestine
Current Affiliation: 
Department of Chemistry, An-Najah National University, Nablus, Palestine
[email protected]
Ali. Z. Abu Zuhria
Chemistry Department, Faculty of Science , An-Najah National University , Nablus, Palestine
Mohammad Hannouna
Chemistry Department, 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 × 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 × 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).