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Document Type |
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Thesis |
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Document Title |
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Nanoparticles synthesis and their application to electrochemical detection of various analytes including metals and inorganic ions تركيب مواد متناهية الصغر وتطبيقاتها في التحليل الكيميائي الكهربائي للكشف عن المعادن والأيونات غير العضوية |
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Subject |
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Faculty of Sciences |
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Document Language |
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Arabic |
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Abstract |
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Most of disinfection by-products (DBPs) of the drinking water disinfection are carcinogenic. Therefore, the detection of DBPs is of a primary importance in order to ensure the safety and quality of drinking water. Most of copper contamination in drinking water happens in the water delivery system, as a result of corrosion of the copper pipes or fittings. Factors causing corrosion include acidity (low pH), high temperature, low total dissolved solids content and high amounts of dissolved oxygen or carbon dioxide. Therefore, there is a need for a simple, inexpensive method to determine Cu content in water. Improvement of a simple, sensitive and rapid electrochemical method for accurate determination of chlorite ion (ClO2-), dibromoacetic acid (DBA) and Cu metal were the main goal of this research. A simple, inexpensive and quickly set up voltammetric procedure has been employed for the detection of chlorite ion (ClO2-), dibromo acetic acid (DBA) and copper (Cu) in drinking water. The magnetite nanoparticles (Fe3O4), synthesized to fabricate magnetite modified carbon paste electrode (Fe3O4/CPE), was used for ClO2- determination. Electrochemical impedance spectroscopy (EIS) was applied to investigate the performance of Fe3O4/CPE. An oxidation peak of ClO2- exhibited on CV voltammogram at +0.73 V in 0.1 M pH 7 phosphate buffers, at a scan rate of 50 mV/s. SWV parameters were adjusted, and the calibration curve for a wide range of concentrations of 1-100 μM was performed. The limit of detection (LOD) was calculated to be 8.6 x 10-9M. Glassy carbon electrode (GCE) was prepared for the detection of DBA by modifying the surface of electrode with CuO nanoparticles. Electrochemical properties of the modified electrode (CuO/GCE) were studied by cyclic voltammetry at san rate of 50 mV/s. The reduction peak of DBA was observed at - 0.787 V. Also, EIS was performed and exhibited good results for CuO/GCE comparing to bare GCE. In addition, chronoamperometry and scan rate effects were examined. An excellent linearity of current versus concentration was observed with regression factor (R2) of 0.997.
The determination of heavy metals in naturals waters is of interest in the studies of the environmental cycles of trace metals. A simple and sensitive method for detection of copper is cyclic voltammetry (CV). The detection of Cu by cyclic voltammetry using a modified glassy carbon electrode was described. For explanation of voltammetric behavior of modified electrode in copper solution, cyclic voltammograms were recorded. An oxidation peak of Cu to Cu+1 was found in the positive region of potential at 0.047 V. Two reduction peaks for Cu+1 and Cu+2 was exhibited at - 0.114 and - 0.234 V respectively. The peak current for copper oxidation was found to increase with increasing concentration from 0.1 to 2 mM for seven average data points (n = 7). As it is indicated using the numerical value of coefficient of variation for this experiment, the data sets showed a good linear fit because the value of R is approaching positive one (0.9968). |
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Supervisor |
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Dr.. Ikram Yousef Danes |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1438 AH
2017 AD |
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Co-Supervisor |
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Dr. Mohamed Taher Somuro |
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Added Date |
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Wednesday, July 19, 2017 |
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Researchers
| إيمان أحمد الزهراني | Al-Zahrani, Eman Ahmed | Researcher | Master | |
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