Spectrophotometric Determination of Nickel with 3-Hydroxy-3-n-propyl-1-p-carboxyphenyltriazene

Abstract

The reagent 3-hydroxy-3-n-propyl-1-p-carboxyphenyltriazene has been
used for spectrophotometric determination of Ni(II). It forms a light green
ethanol soluble complex with Ni(II) in the ratio 1 : 2 (NiR₂), with absorption
maximum at 380 nm and optimum pH 6.8 to 8.0. The molar absorptivity
and Sandell's sensitivity values are 7000 dm³ mol^-1 cm^-1 and 8.3
ng/cm² respectively. Beer's law is obeyed over the concentration range of
0.3 ppm to 1.7 ppm of Ni(II). The stability constant has been worked out
to be log   β= 9.0. Standard deviation (10 determinations) for 4.69 ppm of
Ni(II) has been found to be   ±0.007 ppm. Interference studies have also
been done.