Spectrophotometric determination of Cobalt II with PAN using Flow injection technique.

Volume 17 , Issue 4 , December 2015 , Pages 129-144

Authors

¹ College of Education Science, Salahaddin University

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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