| 作者简历 | 第7-9页 |
| 摘要 | 第9-17页 |
| Abstract | 第17-19页 |
| Chapter 1 Introduction | 第23-39页 |
| 1.1 Objectives and Implications of the Research | 第23-25页 |
| 1.2 Literature Review of the Enrichment, Controlling Factors, Spatial and Tempora Variations of Arsenic Concentration in Groundwater | 第25-36页 |
| 1.2.1 Mechanisms of Arsenic Enrichment in Groundwater | 第25-26页 |
| 1.2.2 Controlling Factors of Arsenic Concentration in Groundwater | 第26-32页 |
| 1.2.3 Spatial Variations of Arsenic Concentration in Groundwater | 第32-34页 |
| 1.2.4 Temporal Variations of Arsenic Concenration in Groundwater | 第34-36页 |
| 1.3 Arsenic Occurrence at Jianghan Plain | 第36-39页 |
| Chapter 2 Regional Hydrogeology | 第39-50页 |
| 2.1 Physical Geographical Condition | 第39-42页 |
| 2.1.1 Meteorological and hydrological condition | 第40页 |
| 2.1.2 Topographic and geomorphic characteristics | 第40-42页 |
| 2.2 Regional Geological Background | 第42-43页 |
| 2.2.1 Stratum lithologic features | 第42-43页 |
| 2.2.2 Geological structure | 第43页 |
| 2.3 Regional Hydrogeological Conditions | 第43-45页 |
| 2.3.1 Aquifer structures and groundwater types | 第43-44页 |
| 2.3.2 Groundwater recharge, flow, and discharge conditions | 第44-45页 |
| 2.4 The Field Monitoring Site at Jianghan Plain | 第45-50页 |
| 2.4.1 Location of the field monitoring site | 第45-48页 |
| 2.4.2 The installation of the monitoring wells | 第48-50页 |
| Chapter 3 Hydrogeochemistry and Occurrence of Arsenic in Groundwaterat Jianghan Plain | 第50-68页 |
| 3.1 Introduction | 第50-51页 |
| 3.2 Materials and Methods | 第51-53页 |
| 3.2.1 Groundwater sampling | 第51-52页 |
| 3.2.2 Analytical methods | 第52页 |
| 3.2.3 Statistical analysis | 第52-53页 |
| 3.3 Results | 第53-62页 |
| 3.3.1 Hydrogeochemistry | 第53-58页 |
| 3.3.2 Concentrations and distribution of arsenic in groundwater | 第58-59页 |
| 3.3.3 Other elements related to high arsenic groundwater | 第59-60页 |
| 3.3.4 Statistical evaluation of the data | 第60-62页 |
| 3.4 Discussion | 第62-66页 |
| 3.4.1 Sources and potential mechanisms for the release of As | 第62-64页 |
| 3.4.2 Differences and similarities with other high-arsenic groundwater regions | 第64-66页 |
| 3.5 Conclusions | 第66-68页 |
| Chapter 4 Temporal Variation of Groundwater Level and ArsenicConcentration at Jianghan Plain | 第68-90页 |
| 4.1 Introduction | 第68-70页 |
| 4.2 Materials and Methods | 第70-71页 |
| 4.2.1 Sampling Method | 第70页 |
| 4.2.2 Analytical methods | 第70-71页 |
| 4.3 Results | 第71-85页 |
| 4.3.1 Water levels | 第76-77页 |
| 4.3.2 Major Constituents | 第77-81页 |
| 4.3.3 Arsenic | 第81-83页 |
| 4.3.4 Redox-sensitive constituents | 第83-85页 |
| 4.4 Discussion | 第85-89页 |
| 4.4.1 Effects of water level on groundwater As conentration | 第85-86页 |
| 4.4.2 Effects of redox-sensitive constituents on groundwater As concentration | 第86-87页 |
| 4.4.3 Effects of labile organic carbon on groundwater As concentration | 第87-89页 |
| 4.5 Conclusions | 第89-90页 |
| Chapter 5 Distribution and Speciation of Arsenic in the Shallow AquiferSediments at Jianghan Plain | 第90-110页 |
| 5.1 Introduction | 第90-92页 |
| 5.2 Materials and Methods | 第92-93页 |
| 5.2.1 Sediments Sampling | 第92页 |
| 5.2.2 Sediments analysis | 第92-93页 |
| 5.3 Results | 第93-105页 |
| 5.3.1 Lithology and mineralogy of the sediments | 第93-100页 |
| 5.3.2 Chemical compositions of the sediments | 第100-102页 |
| 5.3.3 Arsenic and iron speciation in the sediments | 第102-105页 |
| 5.4 Discussion | 第105-108页 |
| 5.4.1 Groundwater table and lithology controls on As speciation in the sediments | 第105-106页 |
| 5.4.2 The sources of As in the sediments | 第106-107页 |
| 5.4.3 Effects of sediments As distribution and speciation on groundwater As concentration | 第107-108页 |
| 5.5 Conclusions | 第108-110页 |
| Chapter 6 Alternating release and retention of arsenic coupled to periodicaeration of sediments in the Jianghan Plain | 第110-132页 |
| 6.1 Introduction | 第110-111页 |
| 6.2 Materials and Methods | 第111-114页 |
| 6.2.1 Field Area and Sediment Collection | 第111-112页 |
| 6.2.2 Sediment Characterization | 第112-113页 |
| 6.2.3 Batch Incubation | 第113-114页 |
| 6.3 Results | 第114-125页 |
| 6.3.1 Sediment mineralogy and composition | 第114-117页 |
| 6.3.2 Batch incubation experiments:Eh,pH and alkalinity | 第117-118页 |
| 6.3.3 Batch incubation experiments:As,Fe,and Mn release | 第118-123页 |
| 6.3.4 Aqueous Arsenic Speciation | 第123-125页 |
| 6.4 Discussion | 第125-130页 |
| 6.4.1 Redox control on As release and retention | 第125-127页 |
| 6.4.2 Reactivity of Organic Carbon and Fe-oxides | 第127-130页 |
| 6.5 Conclusions | 第130-132页 |
| Chapter 7 Conclusions and Suggestions | 第132-137页 |
| 7.1 Conclusions | 第132-136页 |
| 7.2 Suggestions for future work | 第136-137页 |
| Acknowledgements | 第137-139页 |
| References | 第139-155页 |
