SQUARE WAVE CATHODIC STRIPPING VOLTAMMETRY ADSORPTIVE FOR NICKEL AND COBALT ANALYSIS
ABSTRACT: The adsorptive
stripping voltammetric determination of Ni and Co based on adsorption of the
Ni/Co and dimethylglioxime (DMG) complex on a hanging mercury drop electrode is
studied. The reduction current of the adsorbed DMG complex is measured by
square wave cathodic stripping voltammetry method. The effect of various parameters
such as ligand concentration, pH of supporting electrolytic, adsorption
potential and adsorption time on the current peak of Ni and Co voltammogram
were studied. Optimum condition of this method are supporting electrolyte pH 9,
DMG concentration 5×10-4 M, adsorption potential -0.7 V vs Ag/AgCl and
adsorption time 180 second. A linier relationship between the current peak and
Ni or Co concentration was obtained in the range 5 – 30 ng/mL and the detection
limit 0.6 ng/ml for both Ni and Co. The recovery of Ni and Co were
98.11-104.17% using standard biological materials with RSD 2.59 – 10.37%. Based
on “t” test can be conclude that the result are nearly equal to the standard
reference material.
Author: Saryati, Rukihati and
Sumardjo
Journal Code: jpkimiagg060023
