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Open Access

Stable chlorine isotopic signatures and fractionation mechanism of groundwater in Anyang, China

Xiao-xia Tong1, Rong Gan2( ), Shu-qian Gu2, Xing-le Sun3, Kai-tuo Huang4, Xiao-feng Yan5
China geological Environmental Monitoring Institute, Beijing 100081, China
School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China
Henan ProvincialGeological Environment PlanningDesign Co., ltd, Zhengzhou 450001, China
Henan Provincial Institute of Geological Environment Exploration, Zhengzhou 450001, China
Henan Baoyuan Exploration Technology Co., Ltd, Zhengzhou 476341, China
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Abstract

The present work provides an online Bench II-IRMS technique for the measurement of stable chlorine isotope ratio, which is used to measure the δ37Cl of 38 groundwater samples from the Karst and Quaternary aquifers in Anyang area. The regional distribution and signature of δ37Cl value are characterized on the base of isotopic data. The results suggest that the δ37Cl value of Quaternary groundwater decreases with increasing Cl− concentration, and has no correlation with δ18O and δD values, but closely correlates with the depth to water table. The fractionation mechanism of the chlorine isotope is expounded according to the type of groundwater. The δ37Cl value of karst water is generally positive, which is relevant to the dissolution of evaporite (gypsum mine), and may be caused by the mixing of groundwater and precipitation. The groundwater of Quaternary unconfined aquifer is mainly recharged by precipitation, and the δ37Cl value of groundwater is generally negative. The δ37Cl value of groundwater in Quaternary confined aquifer is more negative with increasing the depth to water level and elevated Cl− concentration, which is possible to result from the isotope fractionation of ion filtration. The groundwater with inorganic pollutants in Quaternary unconfined aquifer has generally a positive δ37Cl value.

Keywords

GroundwaterNorth China PlainGas Bench II-IRMSChlorine isotopeKarst aquifer

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Journal of Groundwater Science and Engineering
Volume 10 Issue 4,
December 2022
Pages 393-404
DOI: 10.19637/j.cnki.2305-7068.2022.04.007
Cite this article:
Tong X-x, Gan R, Gu S-q, et al. Stable chlorine isotopic signatures and fractionation mechanism of groundwater in Anyang, China. Journal of Groundwater Science and Engineering, 2022, 10(4): 393-404. https://doi.org/10.19637/j.cnki.2305-7068.2022.04.007

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Received: 20 July 2022
Accepted: 04 November 2022
Published: 27 December 2022
© 2022 Journal of Groundwater Science and Engineering Editorial Office
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