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The question of how saline-alkaline groundwater can be used as a CO2 sink in arid saline-alkaline areas remains controversial. This study investigates the role of saline-alkaline groundwater as a CO2 sink using a mass balance method, Gibbs diagrams of the hydrochemistry, and carbon isotope (δ13CDIC) measurements. Twenty-eight groundwater samples of varying electrical conductivity (EC; 1.52-52.34 mS cm-1) were collected at different depths (1-2 and 5-25 m) in the Hetao Basin of Inner Mongolia, China. The results showed that groundwater ion