典型大型沉积平原封闭地下水的水文地球化学特征、成因和水质评价。

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Water Environment Research Pub Date : 2024-08-01 DOI:10.1002/wer.11088
Yuqing Zhang, Yong Xiao, Hongjie Yang, Liwei Wang, Jie Wang, Wenxu Hu, Ning Wang, Zhongyuan Xu, Gongxi Liu, Feiyu Chen, Xu Guo
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引用次数: 0

摘要

干旱沉积平原的承压地下水受到长期人为开采的干扰,其水化学质量是可持续发展所必需的。本研究调查了华北平原中部承压地下水的水化学特征、形成、潜在健康威胁和水质适宜性。研究结果表明,研究区域的承压地下水呈弱碱性,主要以新鲜软弱的 Cl-Na 和 HCO3-Na 类型为主。水化学受水与岩石相互作用的影响,包括蒸发岩的溶解和阳离子交换。在取样的封闭地下水中,约 97% 的 F- 含量超过规定标准。这主要是由于矿物溶解、阳离子交换和 HCO3 竞争性吸附等地质因素造成的,也可能是由于抽取地下水而从压实土壤中释放出来的。封闭地下水中富集的 F- 可对 90% 以上的人口造成中度和高度非致癌风险。它对研究区东北部的人口,尤其是婴儿和儿童的健康威胁最大。为实现可持续发展,应避免在该地区长期使用封闭地下水进行灌溉,还应注意潜在的土壤盐碱化和渗透风险。根据熵加权水质指数,研究区域内 97% 的封闭地下水水质为优或良,可用于生活用水。然而,高 F- 含量造成的非致癌健康风险不容忽视。因此,建议根据承压地下水水质的空间异质性,实行差异化供水,确保地下水资源的科学合理利用。实践点:研究了干旱沉积平原受长期人为开采干扰的承压地下水水化学质量。评估了承压地下水对灌溉和饮用等多种用途的适宜性。揭示了封闭地下水在多种因素影响下的水化学特征和形成机理。
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Hydrogeochemical features, genesis, and quality appraisal of confined groundwater in a typical large sedimentary plain.

The confined groundwater of arid sedimentary plains has been disturbed by long-term anthropogenic extraction, and its hydrochemical quality is required for sustainable development. The present research investigates the hydrochemical characteristics, formation, potential health threats, and quality suitability of the confined groundwater in the central North China Plain. Results show that the confined groundwater has a slightly alkaline nature in the study area, predominantly dominated by fresh-soft Cl-Na and HCO3-Na types. Water chemistry is governed by water-rock interactions, including dissolution of evaporites and cation exchange. Approximately 97% of the sampled confined groundwaters exceed the prescribed standard for F-. It is mainly due to geological factors such as mineral dissolution, cation exchange, and competitive adsorption of HCO3 - and may also be released from compacted soils because of groundwater extraction. Enriched F- in the confined groundwater can pose an intermediate and higher non-carcinogenic risk to more than 90% of the population. It poses the greatest health threat to the population in the north-eastern part of the study area, especially to infants and children. For sustainable development, the long-term use of confined groundwater for irrigation in the area should be avoided, and attention should also be paid to the potential soil salinization and infiltration risks. In the study area, 97% of the confined groundwaters are found to be excellent or good quality for domestic purposes based on Entropy-weighted Water Quality Index. However, the non-carcinogenic health risk caused by high contents of F- cannot be ignored. Therefore, it is recommended that differential water supplies should be implemented according to the spatial heterogeneity of confined groundwater quality to ensure the scientific and rational use of groundwater resources. PRACTITIONER POINTS: The hydrochemistry quality of confined groundwater in an arid sedimentary plain disturbed by long-term anthropogenic extraction was investigated. The suitability of confined groundwater for multiple purposes such as irrigation and drinking were evaluated. The hydrochemical characteristics and formation mechanism of confined groundwater under the influence of multiple factors were revealed.

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来源期刊
Water Environment Research
Water Environment Research 环境科学-工程:环境
CiteScore
6.30
自引率
0.00%
发文量
138
审稿时长
11 months
期刊介绍: Published since 1928, Water Environment Research (WER) is an international multidisciplinary water resource management journal for the dissemination of fundamental and applied research in all scientific and technical areas related to water quality and resource recovery. WER''s goal is to foster communication and interdisciplinary research between water sciences and related fields such as environmental toxicology, agriculture, public and occupational health, microbiology, and ecology. In addition to original research articles, short communications, case studies, reviews, and perspectives are encouraged.
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