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首页> 外文期刊>Journal of Hydrology >Spatial distribution and origin of shallow groundwater iodide in a rapidly urbanized delta: A case study of the Pearl River Delta
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Spatial distribution and origin of shallow groundwater iodide in a rapidly urbanized delta: A case study of the Pearl River Delta

机译：快速城市化三角洲浅层地下水碘化物的空间分布及起源 - 以珠江三角洲为例

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Iodine-rich groundwater is a cause for concern because it is harmful to human health, and determining the sources of groundwater iodine in coastal urbanized areas is complicated. This study aims to delineate the spatial distribution of groundwater iodide in various shallow and unconfined aquifers, as well as in areas with different urbanization levels in the Pearl River Delta (PRD), and to identify the origins of iodide-rich ( > 0.08 mg/L) groundwater in this region. Approximately 400 groundwater samples, 10 surface water samples, and 9 leachate samples were collected, and a total of 17 chemicals were analyzed. The result showed that iodide-rich groundwater was present in 13.95% of shallow granular aquifers and 6.82% of shallow fissured aquifers; however, it was not present in karst aquifers. In shallow granular aquifers, the proportions of iodide-rich groundwater in areas with different urbanization levels were similar. On the other hand, in shallow fissured aquifers, iodide-rich groundwater mostly appeared in urbanized areas, and its proportion was more than three times that of non-urbanized areas; however, it was not present in peri-urban areas. The reductive dissolution of iodine-loaded Fe/Mn (oxy)hydroxides and decomposition of iodine-rich organic matter in sediments were likely the main sources of iodide-rich groundwater in shallow granular aquifers. Urbanization accompanied by wastewater leakage was also a significant source for iodide-rich groundwater in granular aquifers of urbanized areas. In contrast, the degradation of organic matter in carbonate-rich rocks and urbanization accompanied by leakage of reductive sewage were most likely responsible for the occurrence of iodide-rich groundwater in shallow fissured aquifers. The leakage of landfill leachate was also a significant source for iodide-rich groundwater in the fissured aquifers of non-urbanized areas.
机译：富含碘地下水是一个令人担忧的原因，因为它对人类健康有害，并确定沿海城市化地区的地下水碘来源复杂。本研究旨在描绘各种浅层和无间含水层的地下水碘化物的空间分布，以及珠江三角洲（珠三角）不同城市化水平的地区，并确定富含碘化物的起源（> 0.08毫克/ l）该地区的地下水。收集约400个地下水样品，10个地表水样和9个渗滤液样品，分析了17种化学物质。结果表明，富含碘化物的地下水以13.95％的浅颗粒含水层存在，6.82％的浅裂隙含水层;然而，它不存在于喀斯特含水层中。在浅颗粒含水层中，富含城市化水平的地区富含碘化物的地下水的比例相似。另一方面，在浅浅的含水层中，富含碘化物的地下水主要出现在城市化地区，其比例超过了非城市化地区的三倍;但是，它不存在于围城地区。的还原溶解碘加载铁/锰（氧）氢氧化物和分解碘富含有机物沉积物有可能的碘化物富主要来源地下水在浅粒状含水层。城市化伴有废水泄漏也是富含城市化地区颗粒含水层的富含碘化物地下水的重要来源。相比之下，富含碳酸盐的岩石和城市化中有机物质的降解伴随着减少污水泄漏的伴随着涉及浅裂痕含水层的富含碘化物地下水的原因。垃圾填埋场渗滤液的泄漏也是非城市化区域的含水含水层中富含碘化物地下水的重要来源。

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