To better understand the effects of recharge and discharge on the hydrogeochemistry of high levels of arsenic (As) and fluoride (F) in groundwater, environmental isotopic composition (δ2H and δ18O) and chloride (Cl) concentrations were analyzed in 29
groundwater samples collected from the Datong Basin. High arsenic groundwater samples (As > 50 μg/L) were found to be enriched in lighter isotopic composition that ranged from −92 to −78 ‰ for deuterium (δ2H) and from −12.5 to −9.9 ‰
for oxygen-18 (δ18O). High F-containing groundwater (F > 1 mg/L) was relatively enriched in heavier isotopic composition and varied from −90 to −57 ‰ and from −12.2 to −6.7 ‰ for δ2H and δ18O, respectively.
High chloride concentrations and δ18O values were primarily measured in groundwater samples from the northern and southwestern portions of the study area, indicating the effect of evaporation on groundwater. The observation of relatively homogenized and low δ18O
values and chloride concentrations in groundwater samples from central part of the Datong Basin might be a result of fast recharge by irrigation returns, which suggests that irrigation using arsenic-contaminated groundwater affected the occurrence of high arsenic-containing groundwater in
School of Environmental Studies & State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 430074, Wuhan, China.
Publication date: February 1, 2013
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