Noor, Suhailey Mohd
(2006)
Determination of lead in commercial mineral water
by differential pulse anodic
stripping vol tammetry technique.
Other.
Universiti Sains Malaysia.
(Submitted)
Abstract
Voltammetric determination of lead in commercial mineral water using Differential
Pulse Anodic Stripping Voltammetry (DPASV) technique is described. The
analysis is carried without any pretreatment and using Britton-Robinson buffer as
the supporting electrolyte. The electrodes used in this analysis are hanging
mercury dropping electrode (HMDE), which act as the working electrode, a
platinum electrode as auxiliary electrode and an Ag/AgKCisat reference electrode,
respectively. Optimum voltammetric parameter for the analysis of the samples
such as initial potential (E,), final potential (Et), deposition potential (Eacc),
deposition time (tacc) and scan rate (v) are determined prior to sample analysis
using lead standard solution. Optimum voltammetric condition of analysis, pH of
supporting electrolyte is also determined. The detection of lead is carried out at
concentration of 15 parts per billion (ppb). The result shows that the optimum
voltammetric parameters for the determination of lead in mineral water were, initial
potential, ~of -0.7 Volt, final potential, Et of -0.2 Volt, deposition potential, Eacc of
-0.7 Volt, deposition time, tacc of 140 seconds and scan rate (v) of 0.020 Volt per
second was obtained. The pH 3.0 was found out to be the optimum voltammetric
condition for the determination of lead in samples. 15 different samples of mineral
water were analyzed in this research project. The results show that for all the
samples, lead was not detected.
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