Complexation of Ni (II) by using 5-Nitrosalicylaldehyde Semicarbazone (NSS) as a Novel Analytical Reagent and Its Spectrophotometric Determination

5-Nitrosalicylaldehyde semicarbazone (NSS) is proposed as a new sensitive reagent for the sensitive
extractive spectrophotometric determination of Ni (II). NSS reacts with Ni (II) in the pH range 4.0 to 4.4 to
form a coloured complex, which was well extracted into Ethyl acetate. The absorption spectrum of Ni (II)
NSS complex in Ethyl acetate shows maximum absorbance at 420 nm. It was observed that the colour
development was instantaneous and stable for 48 hrs. The system obeyed Beer’s law up to 1-6 µg / cm3
. The
molar absorptivity calculated was found to be 2.5016 * 104
lit mol-1
cm
-1
and the sensitivity of the method as
defined by sandal’s was 1.067 * 10-2
μg/cm2
. The composition of the extracted species was determined by
Job’s Continuous variation method and Mole ratio method was found to be 1:4. It may be satisfactorily
applied for the determination of Ni (II) with present method.
KeyWords- Calibration curve, Ethyl acetate, Mole ratio meth