Arid Zone Research ›› 2022, Vol. 39 ›› Issue (3): 810-819.doi: 10.13866/j.azr.2022.03.14

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Spatiotemporal variations of stable hydrogen and oxygen isotopes in Xinjiang tap water

XIA Yijie1,2(),WANG Shengjie1,2(),ZHANG Mingjun1,2   

  1. 1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, Gansu, China
    2. Key Laboratory of Resource Environment and Sustainable Development of Oasis of Gansu Province, Lanzhou 730070, Gansu, China
  • Received:2021-08-25 Revised:2021-12-29 Online:2022-05-15 Published:2022-05-30
  • Contact: Shengjie WANG E-mail:1174573432@qq.com;geowang@126.com

Abstract:

Stable hydrogen and oxygen isotopes are natural tracers reflecting the water cycle process, and tap water is an important domestic water source. The variation of stable hydrogen and oxygen isotopes in tap water is useful for tracing sources of domestic water supply and provides a reference for rational water resource management. The measured isotopic data of 352 tap water samples in Xinjiang were applied to analyze the spatiotemporal variation of stable hydrogen and oxygen isotopes as well as deuterium excess (d-excess; d = δ2H - 8δ18O) in tap water. The results show that the d-excess of the tap water line in Xinjiang is δ2H = 7.67δ18O + 10.54 (R2 = 0.92). The value of δ2H ranges from -105.57‰ to -37.82‰ on a monthly basis, and δ18O ranges from -14.48‰ to -6.67‰. The d-excess fluctuates from 1.89‰ to 24.38‰. The stable hydrogen and oxygen isotopes, as well as d-excess, exhibit seasonal variation in both northern and southern Xinjiang, and the seasonal difference in southern Xinjiang is greater than that in northern Xinjiang. The BW model is applied to map the stable hydrogen and oxygen isotopes in tap water. Tap water in southern Xinjiang presents higher isotopic values than northern Xinjiang, and water in the mountainous regions shows lower isotopic values than does water in the low-lying basins.

Key words: tap water, stable hydrogen and oxygen isotopes, d-excess, spatio-temporal variation, Xinjiang