Use of 3-Hydroxy-3-Phenyl-1-m-Hydroxyphenyltriazene in the Spectrophotometric Determination of Cobalt(II)

Abstract

The tile reagent has been used for spectrophotometric determination

of Co(II). The composition of yellow coloured complex has

been found to be 1 : 2 (Co : R) with absorption maximum at 404

nm in the pH range 6.80-7.45. Absorbance measurements were

made at 412 nm. Beer's law was followed in the studied concentration

range 5.0 x 10^–6 M to 3.0 x 10^–5 M. The value of molar

absorptivity, Sandell's sensitivity, stability constant (log β) and free

energy of formation were found to be 20,000 L/mole cm, 2.94

ng/cm², 10.18 and -13.88 kcal/mole respectively. Interference of

twentyfive diverse ions has been examined.