NEW ANALYTICAL TECHNIQUE FOR DETERMINATION OF TRACE AMOUNT OF NI (II) BY USING UV-VISIBLE SPECTROPHOTOMETRIC METHOD WITH PHOTOMETRIC REAGENT
Vaibhava S. More*, R. S. Lokhande and S. P. Janwadkar
ABSTRACT
3-nitrosalicylaldehyde thiosemicarbazone (3-NSTS) is proposed as a new photometric reagent for the extractive spectrophotometric determination of Ni (II). (3-NSTS) reacts with Ni (II) and form a stable coloured complex in the pH range 3.0 to 4.0.This was well extracted in n-butanol. The absorption spectrum of Ni (II) (3-NSTS) complex in n-butanol shows maximum absorbance at 440 nm. The system obeyed Beer’s law up to 2-6 ?g / cm3. The molar extinction coefficient was found to be 5.035 x 103 lit mol-1cm-1 and the sensitivity of the method as defined by Sandell’s sensitivity was 1.162 x 10-2 ?g/cm2. The composition of the extracted species was determined by Job’s Continuous variation method, Mole ratio method and slope ratio method and it was found to be 1:3. The proposed reagent is satisfactorily applied for the determination of trace amount of Ni (II) from industrial waste water as well as synthetic and commercial samples.
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