Azlina, Mat Shariff
(2009)
Optimization of the Differential Pulse Cathodic Stripping
Voltammetry Technique for the Determination of Nickel in Pengkalan Chepa River, Kelantan.
Other.
Universiti Sains Malaysia.
(Submitted)
Abstract
Nickel is a very toxic heavy metal which is significant subject of environmental surveillance,
food control and occupational medicine, toxicology and hygiene. Various techniques have
been used for the determination of this heavy metal including inductively"coupled plasma
mass spectrometry (ICP"MS}, flame atomic absorption spectrometry (F AAS) and atomic
emission spectrometry (AES). However, these methods are having disadvantages particularly
time consuming in sample preparation. A voltammetric method as an alternative method for
the determination of the nickel in the river water samples of Pengkalan Chepa River is
described. In this study the determination of nickel in the river water samples collected from
Pengkalan Chepa River was performed by using Differential Pulse Cathodic Stripping
Voltammetry (DPCSV) analysis. All samples were collected from Pengkalan Chepa River at
various places including those from surface and the bottom of the river. From the study, the
optimum condition for the supporting electrolyte, Britton-Robinson Buffer (BRB), 0.04 M
was determined to be at pH 4. The optimum voltammetric parameters with initial potential,
Ei was -0.70 V, fmal potential, Er was "1.15 V, scan rate, v was 0.020 V/s, deposition
potential, Eacc was -0.70 V, deposition time, tacc was 0 second and equilibrium time, teq was
10 seconds. The calibration curve was constructed, using peak height, Ip versus concentration
of nickel standard solution (5 ppm). A linear graph with regression equation, Y= 20.131X +
0.743 and correlation coefficient, r was 0.999. Standard deviation (SD) was 1.063, sensitivity
20.131 nA/ppm and limit of detection was 0.158 ppm or 158 ppb. The results from this study
show that nickel was not detected in all samples using our experimental conditions.
Actions (login required)
 |
View Item |
