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• W3159206421 abstract "Abstract Clay aquitards are semipermeable membranes that allow groundwater flow while retarding solute migration has been researched extensively but also subjected to much debate. At present, there is no evidence of whether the physical and chemical properties of clay soil and the isotopic composition of pore water affect the semipermeable membrane effect. In this study, we collected clay samples from drilling cores (30–90 m) in the Hengshui area located in the North China Plain (NCP), then extracted pore water using a high‐pressure squeezing device. Vertical hydrochemical and isotopic profile variation trends for the pore water were revealed using hydrochemical (Cl − , Na + , Ca 2+ , K + , Mg 2+ , and SO 4 2− ) and stable isotopic measurements of H, O and Cl. The results showed that the hydrochemical clay interlayer pore water of the saline aquifer is Cl/SO 4 ‐Na/Mg type and the average total dissolved solids (TDS) are 10.17 g/L. However, the hydrochemical clay aquitard pore water is of the Cl/SO 4 ‐Na/Ca type with an average TDS of 1.90 g/L. The hydrochemical clay interlayer pore water of aquifer II is of Cl‐Na/Ca type with an average TDS of 1.10 g/L. Our results showed that the water quality of the aquifer II is not affected by the upper part of the saline aquifer, thus the clay aquitard acts as a significant barrier to salt movement. A polarization layer concentrated in ions was formed between the upper part of the saline aquifer and the clay aquitard. The concentration polarization layer increases the salt‐inhibition effect. H, O and Cl isotopic composition results showed significant fractionation. The pore water of aquifer II lacked heavy isotopes ( 2 H, 18 O, 37 Cl), but had significant heavy isotope enrichment in the concentrated polarized layer (the δ 2 H value was −76‰, the δ 18 O value was −8.4‰, and the δ 37 Cl value was 1.59‰). Hyperfiltration thus played a significant role in isotope fractionation." @default.
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• W3159206421 date "2021-05-01" @default.
• W3159206421 modified "2023-10-17" @default.
• W3159206421 title "Effects of ultrafiltration on salt migration and isotopic composition of pore water in groundwater depression area in Hengshui, <scp>NCP</scp>" @default.
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• W3159206421 doi "https://doi.org/10.1002/hyp.14201" @default.
• W3159206421 hasPublicationYear "2021" @default.
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