Document Details
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Document Type |
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Thesis |
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Document Title |
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Studies on Ion Exchangers for Ion Chromatography and its Applications دراسات على المبادلات الأيونية للكروماتوجرافيا الأيونية وتطبيقاتها |
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Subject |
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Girls' College of Education in Jeddah |
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Document Language |
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Arabic |
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Abstract |
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Heavy metals represent a class of chemicals that occurs in a minute concentration in natural biological systems and exerts beneficial or harmful effects on plant, animal and human life. Thus, the overall work of the present thesis can be summarized as follows:
i. Various PVC blends were fully characterized. The exchange capacity of PVC blends towards Cl- ions in aqueous media was in the range 0.242±0.016-0.355±0.190 meq/g solid sorbent.
ii. Two selected PVC blends were applied for complete retention of traces of Bi 3+, Cd 2+ and Hg2+ ions from aqueous iodide media. The kinetics of retention of Bi 3+ and Cd 2+ ions by the selected PVC blends revealed that the uptake of Bi 3+, Cd 2+ and Hg2+ ions followed the first–order rate equation with an overall rate constant k in the range 0.032 – 0.022 h-1. The uptake of the tested metal ions by PVC—NHCH2CH2 (CH3)3N+.I- blend was better and faster than that of PVC—NHCH2CH2 (CH3)3 N+.OH- blend. Moreover, the dependence of extraction on the counter ion can be explained via an "ion exchange extraction" mechanism. The sorption data of Bi 3+, Cd 2+ and Hg2+ ions by the used PVC blends fit well with Langmuir, Freundlich and Dubinin-Radushkevich (D-R)- type sorption isotherm models.
iii. The thermodynamic parameters (ΔH, ΔS and ΔG) of Bi 3+, Cd 2+ and Hg2+ retention by PVC blends were determined from the plots of ln Kc versus 1/T for the investigated ions.
iv. Quantitative sorption and recovery percentages of Bi 3+, Cd 2+ and Hg2+ ions from fresh and industrial wastewater by PVC—NHCH2CH2 (CH3)3N+.I- blend packed column were determined.
v. The ion chromatography employing polyvinyl alcohol with quaternary ammonium groups (6.1006.520 Mtrosep A Supp 5) as stationary phase packed column was applied for the analysis of the selected anions F-, Cl- , Br -, NO2-, NO3-, PO4-3 and SO4-2 in local (31 samples) and imported (10 samples) drinking water marketed in Saudi Arabia. The results revealed disagreement between the values obtained and the claimed values for the halide content.
vi. Finally, the performance of the employed ion chromatography method for analysis of F-, Cl-, Br-, NO2-, NO3-, PO4-3 and SO4-2 ions was critically determined. Moreover, the analytical performance of the column used was also determined from the calculated values of the number (N) and the height equivalent of the theoretical plates (HETP), the separation factor (Rs) and the asymmetry (As) factors for the tested anions. |
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Supervisor |
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Dr. Saleh O. S. Bahaffi |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1430 AH
2009 AD |
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Co-Supervisor |
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Dr. Magdy Y. Abdelaal |
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Added Date |
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Sunday, January 17, 2010 |
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Researchers
| إيمان عبد الرحمن عسيري | Assirey, Eman Abdul-Rahman | Researcher | Doctorate | |
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