| Acknowledgement | 第4-6页 |
| 摘要 | 第6-8页 |
| Abstract | 第8-9页 |
| List of Abbreviations | 第16-17页 |
| 1 Introduction | 第17-21页 |
| 1.1 Statement of the Problem | 第17-18页 |
| 1.2 Objectives of research | 第18-19页 |
| 1.3 Organization of the thesis | 第19-21页 |
| 2 Literature review | 第21-34页 |
| 2.1 Environmental effects of heavy metals | 第21-30页 |
| 2.1.1 Sources of heavy metals contaminations in the environment | 第25-26页 |
| 2.1.2 Entry routes of heavy metals | 第26-27页 |
| 2.1.3 Positive effect of heavy metals | 第27页 |
| 2.1.4 Major pollution accidents of heavy metals | 第27-29页 |
| 2.1.5 Reports from previous work on heavy metals | 第29-30页 |
| 2.2 Research and progress of heavy metal pollution | 第30-34页 |
| 2.2.1 Study on the heavy metals content in the studied area | 第30页 |
| 2.2.2 Application of chemical statistical methods | 第30-31页 |
| 2.2.3 Heavy metals speciation in soil | 第31-34页 |
| 3 Research material and method | 第34-55页 |
| 3.1 Study area | 第34-40页 |
| 3.2 Schematic representation of the research process | 第40-41页 |
| 3.3 Sampling | 第41-45页 |
| 3.3.1 Soil samples | 第41页 |
| 3.3.2 Water samples | 第41-42页 |
| 3.3.3 Agricultural products and hairy vetch samples | 第42-43页 |
| 3.3.4 Hair and urine samples | 第43-45页 |
| 3.4 Analytical method | 第45-55页 |
| 3.4.1 Inductively coupled plasma mass spectrometry (ICP-MS) | 第45-48页 |
| 3.4.2 Analytical methods to calculate Hg | 第48-50页 |
| 3.4.3 Total organic carbon (TOC) | 第50-51页 |
| 3.4.4 Inductively coupled plasma optical emission spectrometry(ICP-OES) | 第51-53页 |
| 3.4.5 Determination of pH value in soil | 第53-55页 |
| 4 Characterization and sources of heavy metal in soils, water and plants | 第55-73页 |
| 4.1 The physicochemical properties of the soil samples | 第55-57页 |
| 4.2 Characterization of the heavy metals in the soil | 第57-58页 |
| 4.3 Characterization of heavy metals in drinking water | 第58-59页 |
| 4.4 Characterization of heavy metals in the agricultural product and hairyvetch samples | 第59-62页 |
| 4.5 Multivariate statistical analyses | 第62-70页 |
| 4.6 Spatial distributions of the heavy metals in soil | 第70-72页 |
| 4.7 Sub-summary | 第72-73页 |
| 5 Risk assessment | 第73-90页 |
| 5.1 Assessment method of heavy metal pollution | 第73-75页 |
| 5.1.1 Enrichment factor and transfer factor | 第73-75页 |
| 5.1.2 The potential ecological risk index | 第75页 |
| 5.2 Enrichment factor and transfer factor analysis | 第75-80页 |
| 5.2.1 Enrichment factor analysis | 第75-76页 |
| 5.2.2 Transfer factor analysis | 第76-80页 |
| 5.3 Potential ecological risk assessment | 第80页 |
| 5.4 Bioavailability analysis | 第80-89页 |
| 5.5 Sub-summary | 第89-90页 |
| 6 Human exposure | 第90-113页 |
| 6.1 Characterization of heavy metals in hair and urine | 第90-94页 |
| 6.2 Age- and gender-related differences in heavy metal levels | 第94-97页 |
| 6.3 The spearmen correlation analysis of heavy metals | 第97-104页 |
| 6.3.1 Correlation between each heavy metal of hair and urine in studiedareas | 第97-99页 |
| 6.3.2 Heavy metal correlation in hair and urine | 第99-104页 |
| 6.4 Health risk assessment | 第104-112页 |
| 6.4.1 Health risk assessment method | 第104-107页 |
| 6.4.2 Daily exposure dose of the heavy metals | 第107-108页 |
| 6.4.3 Risk characteristics | 第108-112页 |
| 6.5 Sub-summary | 第112-113页 |
| 7 Conclusions, Recommendations and novelty statement | 第113-117页 |
| 7.1 Conclusions | 第113-114页 |
| 7.2 Recommendations | 第114-115页 |
| 7.3 Novelty statement | 第115-117页 |
| References | 第117-139页 |
| 作者简历及在学研究成果 | 第139-143页 |
| 学位论文数据集 | 第143页 |
