Ahmad Razali, Ishak
(2007)
Voltammetric Determination of Iron in Powder Milk.
Other.
PPSP, Universiti Sains Malaysia.
(Submitted)
Abstract
In this study, voltammetric method which is one of the electro analytical
techniques is described. The research focused on adsorptive stripping voltammetry
(AdSV) in the presence of catechol for confirmation of electro analytical properties of
iron. The analysis was carried out after acid digestion procedure then measurement was
made using phosphate buffer 7.0 as the supporting electrolyte. The electrodes used in this
analysis were hanging mercury dropping electrode (HMDE) which act as the working
electrode, a platinum electrode as auxiliary electrode and Agl AgKCI reference electrode
respectively. Optimum voltammetric parameter for the analysis of the sample such as
initial potential, final potential, deposition potential, deposition time and scan rate were
determined prior to sample analysis using iron standard solution at 1 ppm. The result
showed that the optimum voltammetric parameters for the determination of iron in
powder milk were, initial potential, (Ei) ofO V, final potential (Er) of -0.7 V, deposition
potential Eacc of -0.6 V, deposition time ofO s and scan rate of0.030 V/s were obtained.
The pH 7.0 was found out to be the optimum voltammetric condition for the
determination of iron in samples. 3 different samples of powder milk were analyzed. The
result showed that, the sample A and B contained 0.5776 and 0.3075 ppm of trace iron
respectively and no iron was detected in sample C
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