Guo Jiju, Cao Wengeng, Li Xiangzhi, Ren Yu, Lu Chongsheng, Wang Yanyan, Song Le, Liu Yang, Sun Xiaoyue
The Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang 050061, China; Key Laboratory of Groundwater Contamination and Remediation, Hebei Province & China Geological Survey, Shijiazhuang 050061, China.
The Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang 050061, China; Key Laboratory of Groundwater Contamination and Remediation, Hebei Province & China Geological Survey, Shijiazhuang 050061, China; Hebei Cangzhou Groundwater and Land Subsidence National Observation and Research Station, Cangzhou 061000, China; Fujian Provincial Key Laboratory of Water Cycling and Eco-Geological Processes, Xiamen 361021, China.
Sci Total Environ. 2024 Dec 20;957:177694. doi: 10.1016/j.scitotenv.2024.177694. Epub 2024 Nov 22.
Groundwater with naturally high‑arsenic (As) concentrations is a pervasive issue across several major plains (basins) traversed by the Yellow River in China. The genesis of this high-As groundwater and its interrelationships among different plains (basins) have consistently been focal and challenging topics for domestic and international experts. The study focuses on the Hetao Basin in the upper Yellow River and the North Henan Plain in its lower reaches. Selecting typical profiles within the study area, a comparative analysis is performed based on the hydrochemical and isotopic signatures of these profiles. This analysis elucidates the distribution patterns, formation environments, and hydrogeochemical evolution models of high-As groundwater under the influence of different sedimentary environments. The results demonstrate that the shallow groundwater in the upper Yellow River is progressively salinizing, and conversely, the lower reaches are exhibiting a gradual alkalization. Redox conditions, the degree of evaporative concentration, and the intensity of groundwater recharge can influence the distribution disparities of high-As groundwater in the upper and lower reaches of the Yellow River. High-As groundwater in the Hetao Basin of the upper Yellow River is predominantly affected by the strength of groundwater reduction. Conversely, in the North Henan Plain of the lower Yellow River, the chemical conditions of the groundwater are more intricate, with As enrichment being influenced by a confluence of factors such as redox conditions, evaporative concentration, and the intensity of groundwater replenishment.
在中国，黄河流经的几个主要平原（盆地）普遍存在天然高砷（As）含量的地下水问题。这种高砷地下水的成因及其在不同平原（盆地）之间的相互关系，一直是国内外专家关注的焦点和具有挑战性的课题。该研究聚焦于黄河上游的河套盆地和下游的豫北平原。在研究区域内选取典型剖面，基于这些剖面的水化学和同位素特征进行对比分析。该分析阐明了不同沉积环境影响下高砷地下水的分布模式、形成环境和水文地球化学演化模型。结果表明，黄河上游的浅层地下水正在逐渐盐化，相反，下游则呈现出逐渐碱化的趋势。氧化还原条件、蒸发浓缩程度和地下水补给强度会影响黄河上下游高砷地下水的分布差异。黄河上游河套盆地的高砷地下水主要受地下水还原强度的影响。相反，在黄河下游的豫北平原，地下水的化学条件更为复杂，砷的富集受到氧化还原条件、蒸发浓缩和地下水补给强度等多种因素的共同影响。
