Voltammetry determination of selenium in various milk samples
The interest concerning against selenium (Se) has been considerable arise in recent years as Se is an essential trace element for humans and it also exhibit toxicity effect in humans depending on its concentration. In this study, determination of the concentration of Se in various milk samples ha...
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| Main Author: | |
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| Format: | Monograph |
| Language: | English |
| Published: |
Universiti Sains Malaysia
2015
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| Subjects: | |
| Online Access: | http://eprints.usm.my/60440/1/OO%20KEE%20LIAN%20-%20e.pdf http://eprints.usm.my/60440/ |
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| Summary: | The interest concerning against selenium (Se) has been considerable arise in recent years
as Se is an essential trace element for humans and it also exhibit toxicity effect in humans
depending on its concentration. In this study, determination of the concentration of Se in
various milk samples had been carried out using differential pulse cathodic stripping
voltammetry (DPCSV) technique. This study provides a methodology that can be used to
determine the concentration of selenium in various milk samples. Three types of raw fresh
milks (goat’s milk, cow’s milk, and horse’s milk) and seven types of processed
commercial milks had been analysed using DPCSV technique. These milk samples were
undergone sample preparation procedure before being analysis. The milk samples were
digested in HN03 : HCIO4 ( 1:1 ) mixture by a wet digestion procedure. All forms of Se in
milk samples were converted into Se(IV) by the addition of HC1. The prepared samples
were undergone dilution before proceed to analysis. The diluted milk samples were then
added with electrolyte constitutes of 3.3g ammonium sulphate, O.lmol/L NaiEDTA
dehydrate, and 100 ppm Cu standard solution before the analysis starts. The DPCSV of
milk samples in HC1 solution showed a peak potential for selenium at -0.65V. The
standard addition method was used to determine Se in the samples. The result for Se
concentration in milk samples were successfully obtained in this study. |
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