| Selected Publications | 第8-9页 |
| Curriculum Vitae of Md. Enamul Huq | 第9-12页 |
| 摘要 | 第12-14页 |
| abstract | 第14-16页 |
| Chapter 1 Introduction | 第26-39页 |
| 1.1 Background | 第26-32页 |
| 1.2 Statement of the problems | 第32-34页 |
| 1.3 Significance and objectives of the study | 第34-35页 |
| 1.4 Rational, context and scope of the study | 第35-36页 |
| 1.5 Scientific contribution | 第36页 |
| 1.6 Thesis structure | 第36-39页 |
| Chapter 2 Theoretical Background and Literature Review | 第39-66页 |
| 2.1 Introduction | 第39-40页 |
| 2.2 Evolution and occurrence of As in groundwater | 第40-44页 |
| 2.3 Chemical form of As | 第44页 |
| 2.4 Groundwater As and threat to the public health | 第44-46页 |
| 2.5 Sources of As | 第46-54页 |
| 2.5.1 Primary sources | 第48-51页 |
| 2.5.2 Secondary sources | 第51-53页 |
| 2.5.3 Tertiary/irrigational re-circulation | 第53-54页 |
| 2.6 As mobilization | 第54-59页 |
| 2.6.1 Reduction of metal oxides and hydroxides | 第54-55页 |
| 2.6.2 Reduction of As(V) to As(III) | 第55-57页 |
| 2.6.3 Biogeochemical processes and organic matter | 第57页 |
| 2.6.4 Pyrite oxidation hypothesis | 第57-58页 |
| 2.6.5 Competitive ion exchange mechanism | 第58-59页 |
| 2.7 Literature review and research gap | 第59-66页 |
| Chapter 3 Research Methodology | 第66-76页 |
| 3.1 Study area | 第66-72页 |
| 3.1.1 Location | 第66页 |
| 3.1.2 Climate | 第66页 |
| 3.1.3 Hydrogeological setting | 第66-70页 |
| 3.1.4 Geology and lithology | 第70-72页 |
| 3.2 Groundwater sampling | 第72-73页 |
| 3.3 Groundwater analysis | 第73-74页 |
| 3.4 Statistical and spatial analysis | 第74-76页 |
| Chapter 4 Distribution and hydrochemical characteristics of high As groundwater | 第76-125页 |
| 4.1 Introduction | 第76-77页 |
| 4.2 Spatial distribution of high As groundwater | 第77-79页 |
| 4.3 Hydrochemical characteristics | 第79-118页 |
| 4.3.1 Contents of major ions and physical parameters | 第79-91页 |
| 4.3.2 Hydrochemical type | 第91-107页 |
| 4.3.3 Comparison of hydrochemical data collected in two different years | 第107-108页 |
| 4.3.4 Trace metals (TMs) | 第108-114页 |
| 4.3.5 Variation of TMs concentration over time | 第114-118页 |
| 4.4 Stable isotope geochemistry | 第118-125页 |
| 4.4.1 Recharge sources of groundwater | 第122-125页 |
| Chapter 5 As enrichment and mobilization in groundwater of Southwestern Bangladesh | 第125-158页 |
| 5.1 As sources | 第125页 |
| 5.2 Influential factors of As enrichment | 第125-128页 |
| 5.2.1 Geographical location and climatic condition | 第125-126页 |
| 5.2.2 Runoff conditions | 第126页 |
| 5.2.3 p H values | 第126-127页 |
| 5.2.4 Redox environment | 第127-128页 |
| 5.2.5 TDS | 第128页 |
| 5.3 The processes responsible for As enrichment and mobilization | 第128-153页 |
| 5.3.1 Redox | 第128-138页 |
| 5.3.2 Role of p H | 第138-139页 |
| 5.3.3 Evaporation | 第139-141页 |
| 5.3.4 Role of ions and TMs to mobilize As | 第141-145页 |
| 5.3.5 Adsorption-desorption and ion exchange process | 第145-148页 |
| 5.3.6 Microbial processes of As mobilization | 第148-150页 |
| 5.3.7 Other factors | 第150-153页 |
| 5.4 Co-occurrence of As and salinity | 第153-155页 |
| 5.5 Groundwater quality with respect WHO, USEPA and Bangladesh standards | 第155-158页 |
| Chapter 6 Comparison of hydrogeochemical behavior in Datong Basin, China and Southwestern, Bangladesh | 第158-191页 |
| 6.1 Introduction | 第158-160页 |
| 6.2 Brief introduction of Datong Basin | 第160-161页 |
| 6.3 Hydrogeochemistry | 第161-177页 |
| 6.3.1 Datong Basin, China | 第161-176页 |
| 6.3.2 Southwestern, Bangladesh | 第176页 |
| 6.3.3 Differences between Datong Basin, China and Southwestern Bangladesh | 第176-177页 |
| 6.4 Arsenic occurrence in groundwater | 第177-183页 |
| 6.4.1 Datong Basin, China | 第177-179页 |
| 6.4.2 Southwestern Bangladesh | 第179-182页 |
| 6.4.3 Differences between Datong Basin, China and Southwestern Bangladesh | 第182-183页 |
| 6.5 As release and enrichment | 第183-191页 |
| 6.5.1 Datong Basin, China | 第183-186页 |
| 6.5.2 Southwestern Bangladesh | 第186-189页 |
| 6.5.3 Differences between Datong Basin, China and Southwestern Bangladesh | 第189-191页 |
| Chapter 7 Conclusion and Recommendation | 第191-196页 |
| 7.1 Conclusions | 第191-193页 |
| 7.2 Recommendations | 第193-195页 |
| 7.3 Limitations and future work | 第195-196页 |
| References | 第196-215页 |
| Acknowledgements | 第215页 |
