Research Article

Tracing the Origin of Groundwater Nitrate in an Area Affected by Acid Rain Using Dual Isotopic Composition of Nitrate

Figure 7

The relationship between NO3- and Cl- for spring and evapotranspiration line for rainfall (a) and between NO3- and NO3-/Cl- (b). During evapotranspiration, NO3-/Cl- would remain constant.
(a)
(b)