Voltammetric Determination of Nickel in Chocolate by Differential Pulse Cathodic Stripping Analysis
The determination of nickel in the chocolate was performed by Differential Pulse Cathodic Stripping Analysis(DPCSV). Chocolate was a complex sample with a high content of organic compounds such as sugar, protein, fat, lecithin and many more and its analysis generally involves digestion procedures...
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| Format: | Monograph |
| Language: | English |
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PPSP, Universiti Sains Malaysia
2007
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| Online Access: | http://eprints.usm.my/50210/ http://eprints.usm.my/50210/1/MOHAMAD%20ZAIRY%20AZREN%20BIN%20JAINAL%40%20ZAINAL-%2024%20pages.pdf |
| _version_ | 1848881660261564416 |
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| author | Mohammad Zairy Azren, Jainal@ Zainal |
| author_facet | Mohammad Zairy Azren, Jainal@ Zainal |
| author_sort | Mohammad Zairy Azren, Jainal@ Zainal |
| building | USM Institutional Repository |
| collection | Online Access |
| description | The determination of nickel in the chocolate was performed by Differential Pulse
Cathodic Stripping Analysis(DPCSV). Chocolate was a complex sample with a high
content of organic compounds such as sugar, protein, fat, lecithin and many more and its
analysis generally involves digestion procedures that might include the risk of losses
and/or contamination. Wet digestion by using concentrated nitric acid and 1:1 ratio of
distilled water-hydrochloric acid on the sample was selected on this study because of its
availability and low cost . Sample was then processed to the sample analysis stage. Prior
to the sample analysis by DPCSV, the optimum pH for the supporting electrolyte,
Britton-Robinson Buffer (BRB}, 0.04 M and optimum parameters for the analysis was
determined. Optimum pH for the supporting electrolyte, BRB was pH 4. Initial potential,
Ei of -0.68 V, final potential, Er of-1.15 V, scan rate of0.050 V/s, deposition potential of
-1.4 V, equilibration time of 5 s and deposition time, tacc of 20 s were the optimized
parameters used in this study. The validation of methodology was performed by plotting
a calibration curve peak height, ip versus different concentrations of nickel (5 ppm) as the
stock solution. A linear graph with the regression equation of Y= 0.820+ 23.322X,
correlation coefficient of 0.966, standard deviation of 1.129, sensitivity of 23.322
nA/ppm and limit of detection of 0.145 ppm was obtained. 3 different brands of chocolate
were analyzed. The results in all samples show absence of nickel. |
| first_indexed | 2025-11-15T18:22:33Z |
| format | Monograph |
| id | usm-50210 |
| institution | Universiti Sains Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T18:22:33Z |
| publishDate | 2007 |
| publisher | PPSP, Universiti Sains Malaysia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | usm-502102021-10-11T03:48:49Z http://eprints.usm.my/50210/ Voltammetric Determination of Nickel in Chocolate by Differential Pulse Cathodic Stripping Analysis Mohammad Zairy Azren, Jainal@ Zainal R Medicine (General) The determination of nickel in the chocolate was performed by Differential Pulse Cathodic Stripping Analysis(DPCSV). Chocolate was a complex sample with a high content of organic compounds such as sugar, protein, fat, lecithin and many more and its analysis generally involves digestion procedures that might include the risk of losses and/or contamination. Wet digestion by using concentrated nitric acid and 1:1 ratio of distilled water-hydrochloric acid on the sample was selected on this study because of its availability and low cost . Sample was then processed to the sample analysis stage. Prior to the sample analysis by DPCSV, the optimum pH for the supporting electrolyte, Britton-Robinson Buffer (BRB}, 0.04 M and optimum parameters for the analysis was determined. Optimum pH for the supporting electrolyte, BRB was pH 4. Initial potential, Ei of -0.68 V, final potential, Er of-1.15 V, scan rate of0.050 V/s, deposition potential of -1.4 V, equilibration time of 5 s and deposition time, tacc of 20 s were the optimized parameters used in this study. The validation of methodology was performed by plotting a calibration curve peak height, ip versus different concentrations of nickel (5 ppm) as the stock solution. A linear graph with the regression equation of Y= 0.820+ 23.322X, correlation coefficient of 0.966, standard deviation of 1.129, sensitivity of 23.322 nA/ppm and limit of detection of 0.145 ppm was obtained. 3 different brands of chocolate were analyzed. The results in all samples show absence of nickel. PPSP, Universiti Sains Malaysia 2007 Monograph NonPeerReviewed application/pdf en http://eprints.usm.my/50210/1/MOHAMAD%20ZAIRY%20AZREN%20BIN%20JAINAL%40%20ZAINAL-%2024%20pages.pdf Mohammad Zairy Azren, Jainal@ Zainal (2007) Voltammetric Determination of Nickel in Chocolate by Differential Pulse Cathodic Stripping Analysis. Other. PPSP, Universiti Sains Malaysia. (Submitted) |
| spellingShingle | R Medicine (General) Mohammad Zairy Azren, Jainal@ Zainal Voltammetric Determination of Nickel in Chocolate by Differential Pulse Cathodic Stripping Analysis |
| title | Voltammetric Determination of Nickel in Chocolate by
Differential Pulse Cathodic Stripping Analysis |
| title_full | Voltammetric Determination of Nickel in Chocolate by
Differential Pulse Cathodic Stripping Analysis |
| title_fullStr | Voltammetric Determination of Nickel in Chocolate by
Differential Pulse Cathodic Stripping Analysis |
| title_full_unstemmed | Voltammetric Determination of Nickel in Chocolate by
Differential Pulse Cathodic Stripping Analysis |
| title_short | Voltammetric Determination of Nickel in Chocolate by
Differential Pulse Cathodic Stripping Analysis |
| title_sort | voltammetric determination of nickel in chocolate by
differential pulse cathodic stripping analysis |
| topic | R Medicine (General) |
| url | http://eprints.usm.my/50210/ http://eprints.usm.my/50210/1/MOHAMAD%20ZAIRY%20AZREN%20BIN%20JAINAL%40%20ZAINAL-%2024%20pages.pdf |