Spectrophotometric Determination of Cobalt with Di-2-Pyridyl Ketone Benzoylhydrazone

shkhalaf's picture
Journal Title, Volume, Page: 
Spectroscopy Letters
Year of Publication: 
Shukri Khalaf
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Nidal A. Zatar
Mohammed A. Al-Nuri
Maher Abu-Eid
Mohammed Hannoun
All Z. Abu-Zuhri
Shukri Khalaf
Mustafa Khamis
Preferred Abstract (Original): 

A method for the spectrophotometric determination of cobalt (II) by complexation with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution is described. Cobalt (II) forms a 1:2 complex with DPKBH. The complex has maximum absorbance at 370 nm. Beer's law is obeyed over the range 0.1 – 2.8 μg.ml. The effect of pH, effect of excess reagent, stability of the complex and the tolerance limit of many metal ions have been reported. The method is applied to the determination of cobalt in different alloys containing other metals ions.