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Accurate identification of nitrate (NO3-) sources is critical to address the issue of groundwater pollution. The nitrogen (N) isotopic enrichment factor (ɛp/s) is an important parameter to explain the N cycle and determine the proportional contribution of NO3- sources. Considering the isotopic fractionation effects in N transformation processes, this study quantitatively analyzed the NO3- sources in groundwater using stable isotopes (δ15N-NO3- and δ18O-NO3-) and the Bayesian isotope mixing model (SIAR). For the first time, the ɛp/s val
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