Spectrophotometric determination of Cobalt II with PAN using Flow injection technique

Spectrophotometric determination of Cobalt II with PAN using Flow injection technique



Sherwan O. Baban

Chemistry   Department, College of Education Science, University of Salahaddin Erbil-Iraq
E-mail: Shirwan_baban@yahoo.co.uk      







Article info


Original: 17 Apr. 2015
Revised: 25 May  2015
Accepted:30 August  2015
Published online: 
20 Dec. 2015 

             
Key Words: 
Cobalt, PAN, Spectrophotometry, flow injection.     
     


Abstract
A simple, rapid, reproducible and sensitive spectrophotometric method for determination of Cobalt (Co2+) was investigated .The method was based on the interaction of Co2+ with 1-(2-pyridylazo)2-naphthol (PAN), in the presence of buffer pH 6 (CH3COOH + CH3COONH4) to give a highly colored species of a molar ratio 1:2 (Co:PAN) .Beers law was obeyed in the range of (0.1-2.5) μg/ml with the molar absorptivity of 3.77x104 L.mol-.cm- at λ max 525 nm. The method was adapted to semi automated flow injection system .The molar absorptivity was 0.16x104 L.mol-.cm- at λ max 525 nm .Beers law was obeyed in the range (0.3-10) μg/ml. The precision and accuracy studied to both systems. The method was applied successfully to the assay of Co2+ in real sample such as real water and waste water, and was well agreed with its certified value.


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Kewan Omer,
Dec 22, 2015, 2:27 PM