The determination of molybdenum in seawater by ICP-AES after preconcentration by diethylenetriaminetetraacetic acid-functionalized polysiloxane.

• Other Authors: Chan, Sze-Man.
• Format: Others
• Language: English; Chinese
• Published: 2002
• Subjects: Molybdenum > Absorption and adsorption; Inductively coupled plasma atomic emission spectrometry; Seawater > Analysis; Silica gel
• Online Access: http://library.cuhk.edu.hk/record=b5891143; http://repository.lib.cuhk.edu.hk/en/item/cuhk-324073

Chan Sze-Man. === Thesis (M.Phil.)--Chinese University of Hong Kong, 2002. === Includes bibliographical references (leaves 65-73). === Abstracts in English and Chinese. === Acknowledgment --- p.i === Table of Contents --- p.ii === Abstract --- p.v === Abstract (Chinese Version) --- p.vi === Chapter Chapter 1 --- Introduction --- p.1 === Chapter 1.1 --- Molybdenum in the Environment --- p.1 === Chapter 1.1.1 --- General Chemistry of Molybdenum --- p.1 === Chapter 1.1.2 --- Molybdenum in Animals and Plants --- p.1 === Chapter 1.1.3 --- Uses of Molybdenum Compounds --- p.3 === Chapter 1.2 --- Inductively Coupled Plasma Atomic Emission Spectrometry --- p.4 === Chapter 1.2.1 --- Principle of ICP-AES --- p.4 === Chapter 1.2.2 --- Inductively Coupled Plasma Emission Source --- p.5 === Chapter 1.2.3 --- Optical System --- p.6 === Chapter 1.2.4 --- Advantages of ICP-AES --- p.7 === Chapter 1.2.5 --- Disadvantages of ICP-AES --- p.8 === Chapter 1.3 --- Preconcentration Method --- p.9 === Chapter 1.4 --- Polysiloxane --- p.11 === Chapter 1.4.1 --- Introduction of Silica-gel --- p.11 === Chapter 1.4.2 --- Introduction of Sol-gel Processes --- p.13 === Chapter 1.4.3 --- Hybrid Inorganic-organic Sol-gel Materials --- p.14 === Chapter 1.4.4 --- Advantages Using Sol-gel Preparation of Organomodified Silica --- p.16 === Chapter 1.5 --- Chelating Resin --- p.19 === Chapter 1.6 --- Scope of Work --- p.21 === Chapter Chapter 2 --- Experimental --- p.22 === Chapter 2.1 --- Apparatus and Instrument --- p.22 === Chapter 2.2 --- Chemicals --- p.24 === Chapter 2.3 --- Samples --- p.25 === Chapter 2.4 --- Procedures --- p.26 === Chapter 2.4.1 --- Preparation of Diethylenetriaminetetraacetic-acid Functionalized Polysiloxane --- p.26 === Chapter 2.4.1.1 --- Preparation of Silica Precursor --- p.26 === Chapter 2.4.1.2 --- Functionalization with Diethylenetriamine --- p.27 === Chapter 2.4.1.3 --- Carboxymethylation of the amine groups of the Polysiloxane --- p.28 === Chapter 2.4.2 --- Preconcentration and Determination of Molybdenum --- p.29 === Chapter 2.4.2.1 --- Optimum pH for Adsorption --- p.29 === Chapter 2.4.2.2 --- Amount of Polysiloxane Required for Sorption of Trace Amount of Molybdenum --- p.29 === Chapter 2.4.2.3 --- Equilibrium Time --- p.30 === Chapter 2.4.2.4 --- Total Adsorption Capacity --- p.30 === Chapter 2.4.2.5 --- Adsorption Isotherm of Molybdenum --- p.30 === Chapter 2.4.2.6 --- Desorption Studies --- p.31 === Chapter 2.4.2.7 --- Effect of Foreign Ions on Preconcentration --- p.31 === Chapter 2.4.2.8 --- Preparation of the Mini-column --- p.32 === Chapter 2.4.2.9 --- Effect of Flow Rate --- p.33 === Chapter 2.4.2.10 --- Reusability of the Mini-column --- p.33 === Chapter 2.4.2.11 --- Preconcentration Factor and Detection Limit --- p.33 === Chapter 2.4.2.12 --- Determination of Mo(VI) in Seawater by ICP-AES --- p.33 === Chapter Chapter 3 --- Results and Discussion --- p.35 === Chapter 3.1 --- Characterization of Diethylenetriaminetetraacetic-acid Functionalized Polysiloxane --- p.35 === Chapter 3.2 --- pH Dependence of Mo(VI) Ion Uptake --- p.44 === Chapter 3.3 --- Amount of Polysiloxane Required for Adsorption of Trace Amount of Mo(VI) --- p.45 === Chapter 3.4 --- Equilibrium Time --- p.46 === Chapter 3.5 --- Total Adsorption Capacity --- p.47 === Chapter 3.6 --- Adsorption Isotherm of Molybdenum --- p.48 === Chapter 3.7 --- Desorption Studies --- p.54 === Chapter 3.8 --- Effect of Foreign Ions on Preconcentration --- p.55 === Chapter 3.9 --- Effect of Flow Rate on the Recovery of Mo(VI) --- p.57 === Chapter 3.10 --- Reusability of the Column --- p.58 === Chapter 3.11 --- Preconcentration Factor --- p.59 === Chapter 3.12 --- Detection Limit --- p.59 === Chapter 3.13 --- Accuracy --- p.60 === Chapter 3.14 --- Determination of Mo(VI) in Seawater Samples --- p.61 === Chapter 3.15 --- Precision --- p.62 === Chapter Chapter 4 --- Conclusion --- p.63 === Chapter Chapter 5 --- References --- p.65