| 长江中游沿岸地下水中有机质分子组成特征及其对碘富集的指示 |
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| 引用本文： | 薛江凯,邓娅敏,杜尧,罗义鹏,程一涵.长江中游沿岸地下水中有机质分子组成特征及其对碘富集的指示[J].地球科学,2021,46(11):4140-4149. |
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| 作者姓名： | 薛江凯 邓娅敏 杜尧 罗义鹏 程一涵 |
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| 作者单位： | 1.中国地质大学地质调查研究院, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金面上项目41977174中国地质调查局二级项目委托项目2020040010 |
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| 摘 要： | 长期摄入高碘地下水（碘浓度＞100 μg/L）会造成人体甲状腺机能损伤.天然有机质被认为是影响高碘地下水形成的关键组分，为研究地下水中溶解性有机质（DOM）分子组成对碘富集的影响，选取长江中游沿岸浅层地下水作为研究对象，运用傅立叶变换离子回旋共振质谱仪（FT-ICR-MS）表征不同碘浓度地下水中DOM分子组成差异.研究发现碘易富集在还原环境的浅层地下水中，地下水中碘的浓度与溶解性有机碳（DOC）浓度无显著关系，DOM分子总数越多碘浓度越高；高碘地下水较低碘水DOM分子均一性、多样性更强，氧化程度和不饱和程度更高，含更多芳香性结构.长江中游沿岸高碘地下水的形成受DOM分子组成控制，主要与不饱和程度高尤其是含芳香性结构的大分子DOM有关，含芳香性结构的DOM分子与碘络合在高碘地下水的形成过程中起重要作用.
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| 关 键 词： | 地下水 碘 溶解性有机质 分子组成 傅立叶变换离子回旋共振质谱仪 水文地质 |
| 收稿时间： | 2020-11-25 |
Molecular Characterization of Dissolved Organic Matter (DOM) in Shallow Aquifer along Middle Reach of Yangtze River and Its Implications for Iodine Enrichment |
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| Xue Jiangkai,Deng Yamin,Du Yao,Luo Yipeng,Cheng Yihan.Molecular Characterization of Dissolved Organic Matter (DOM) in Shallow Aquifer along Middle Reach of Yangtze River and Its Implications for Iodine Enrichment[J].Earth Science-Journal of China University of Geosciences,2021,46(11):4140-4149. |
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| Authors: | Xue Jiangkai Deng Yamin Du Yao Luo Yipeng Cheng Yihan |
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| Abstract: | Long-term uptake of high iodine groundwater (iodine concentration > 100 μg/L) leads to thyroid dysfunction. Natural organic matter is considered to be the key factor affecting the formation of high iodine groundwater. In order to figure out the impact of molecular composition of dissolved organic matter(DOM) on iodine enrichment in groundwater, the DOM in shallow groundwater with different iodine concentrations along the Middle Reach of the Yangtze River was characterized by FT-ICR-MS. Results indicate that iodine was easily enriched in strong reducing environment, and iodine concentrations in groundwater had no significant relationship with DOC concentrations, but had a significant positive correlation with numbers of DOM molecules. Compared with low iodine groundwater, DOM in high iodine groundwater characterized with greater uniformity and diversity, more oxidized and unsaturated molecular composition, containing more aromatic structures. The enrichment of iodine in shallow groundwater along the Middle Reach of the Yangtze River was closely related to the molecular composition of DOM. Complexation of DOM molecules containing aromatic structure with iodine plays an important role in the formation of high iodine groundwater. |
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