by Oi-Ming Cheng. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1996. / Includes bibliographical references (leaves 104-108). / Chapter 1 --- INTRODUCTION / Chapter A) --- Sources of zinc and its functional role --- p.10 / Chapter B) --- Effects of excessive zinc intake --- p.11 / Chapter (a) --- Human --- p.11 / Chapter (b) --- Animal --- p.11 / Chapter (c) --- Fish --- p.12 / Chapter C) --- Techniques in zinc determination --- p.12 / Chapter 2 --- ANODIC STRIPPING VOLTAMMETRY / Chapter A) --- Basic principles --- p.16 / Chapter (a) --- Cell --- p.16 / Chapter (b) --- Electrodeposition and stripping --- p.20 / Chapter B) --- Major interferences in anodic stripping and the common solutions to these problems --- p.25 / Chapter (a) --- Intermetallic compound formation --- p.25 / Chapter (b) --- Overlapping peaks --- p.26 / Chapter (c) --- Organic compounds adsorbed at the electrode --- p.28 / Chapter 3 --- MUTUAL INTERFERENCE FROM ZINC AND COPPER / Chapter A) --- Introduction --- p.30 / Chapter B) --- Review of reported methods to remove copper interference --- p.31 / Chapter (a) --- Dual-working electrode approach --- p.31 / Chapter (b) --- Adjustment of the deposition potential --- p.31 / Chapter (c) --- Standard addition --- p.33 / Chapter (d) --- Addition of a third element --- p.33 / Chapter C) --- The proposed solution --- p.35 / Chapter 4 --- EXPERIMENTAL / Chapter A) --- Proposed method --- p.37 / Chapter (a) --- Apparatus --- p.37 / Chapter (b) --- Reagents --- p.38 / Chapter (c) --- Procedure --- p.40 / Chapter B) --- Reference method --- p.45 / Chapter (a) --- Apparatus --- p.45 / Chapter (b) --- Reagents --- p.45 / Chapter (c) --- Procedure --- p.47 / Chapter 5 --- RESULTS AND DISCUSSION / Chapter A) --- Optimization of instrumental parameters and working conditions --- p.49 / Chapter (a) --- Effect of plating potential on zinc peak current --- p.49 / Chapter (b) --- Effect of plating time on zinc peak current --- p.53 / Chapter (c) --- Effect of holding time and holding potential on zinc peak current --- p.56 / Chapter (d) --- Effect of sweep rate on zinc peak current --- p.58 / Chapter (e) --- Effect of final potential and strip time on zinc peak current --- p.61 / Chapter (f) --- Effect of pH on the peak current and recovery of zinc in the presence of copper after the sulphide treatment --- p.63 / Chapter (g) --- Effect of the concentration of buffer on the peak current --- p.66 / Chapter (h) --- Effect of the reaction time of sulphide with copper on the zinc recovery --- p.68 / Chapter B) --- "Calibration graph, precision and detection limit" --- p.71 / Chapter C) --- Effect of copper on the zinc determination by the proposed method --- p.78 / Chapter D) --- Interference studies --- p.80 / Chapter E) --- Recovery tests --- p.84 / Chapter F) --- Determination of zinc in real samples using the proposed method --- p.86 / Chapter (a) --- Clean water samples such as sea water and tap water --- p.86 / Chapter (b) --- Contaminated natural water and domestic wastewater samples --- p.91 / Chapter (c) --- Air samples --- p.93 / Chapter (d) --- Oyster tissue samples --- p.96 / Chapter (e) --- Sewage sludge and sediment samples --- p.99 / Chapter 6 --- CONCLUSION --- p.102 / REFERENCES --- p.104
| Identifer | oai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_321527 |
| Date | January 1996 |
| Contributors | Cheng, Oi-Ming., Chinese University of Hong Kong Graduate School. Division of Chemistry. |
| Publisher | Chinese University of Hong Kong |
| Source Sets | The Chinese University of Hong Kong |
| Language | English |
| Detected Language | English |
| Type | Text, bibliography |
| Format | print, 108 leaves : ill. ; 30 cm. |
| Rights | Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/) |
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