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The impregnated resin was regenerated by using 80% v/v ethanol and successfully reused up to 3 cycles with slight decrease in the adsorption capacity.Nitrate (NO3-) and nitrous oxide (N2O) accumulate in groundwater in relation to human activities and pose multiple threats to the global environment (harming human health and atmospheric damage). This study focused on the evaluation of groundwater NO3-, N2O, and its indirect emission factor under different land use types (agricultural land, urban land, and forest) and response mechanism of ma