Tracing the Origin of Groundwater Nitrate in an Area Affected by Acid Rain Using Dual Isotopic Composition of Nitrate
Figure 6
The relationship between δ15N-NO3- and δ18O-NO3- for spring water. The range for δ15N-NO3- and δ18O-NO3- and average range for δ15N-NH4+ for precipitation is from Guiyang and Chongqing. The schematic of typical ranges for other sources is from [44, 45].
