School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi Province, China.
The Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang, 050061, Hebei Province, China.
Environ Sci Pollut Res Int. 2021 Mar;28(9):10552-10563. doi: 10.1007/s11356-020-11159-3. Epub 2020 Oct 24.
The lack of information on the origin and behavior of iodine in deep groundwater restricts the development and use of groundwater resources. To address this issue, the Cangzhou region in the eastern North China Plain (NCP) was selected for a case study. In total, 296 deep groundwater samples were collected, their iodine concentrations were determined, and the distribution characteristics of iodine concentrations were analyzed. Iodine concentrations ranged from < 0.002 to 1.22 mg/L, with a mean of 0.19 mg/L; 42% of the samples had high iodine concentrations. The levels were higher in the east than in the west, and most of the samples with high iodine concentrations were obtained from sites east of the boundary between the Cangxian uplift and the Huanghua depression. The weathering and dissolution of iodine-bearing minerals and the leaching of marine sediments can facilitate iodine enrichment. In the Cangxian uplift, iodine was mainly a result of the conversion of organic iodine, while in the Huanghua depression, iodine enrichment was a factor of the conversion of IO. Overall, the main factors for the enrichment of iodine are the sedimentary environmental and the hydrodynamic conditions. Our results provide a theoretical basis to understand the occurrence of high iodine concentrations in deep groundwater.
地下水中碘的来源和行为信息的缺乏限制了地下水资源的开发和利用。为了解决这个问题，选择了中国东部华北平原（NCP）的沧州市进行案例研究。共采集了 296 个深层地下水样本，测定了碘浓度，并分析了碘浓度的分布特征。碘浓度范围为<0.002 至 1.22 毫克/升，平均值为 0.19 毫克/升；42%的样本碘浓度较高。东部的浓度高于西部，且大部分高碘浓度样本均来自沧县隆起与黄骅坳陷边界以东的地点。含碘矿物的风化和溶解以及海洋沉积物的淋滤都有利于碘的富集。在沧县隆起区，碘主要是有机碘转化的结果，而在黄骅坳陷区，碘的富集则是 IO 转化的因素之一。总体而言，碘的富集主要受到沉积环境和水动力条件的影响。我们的研究结果为了解深层地下水中高碘浓度的存在提供了理论依据。
