Ionic ratio | Range | Comment | Interpretation |
SO4/Cl | 0.00 - 0.24 | High | Additional sources of SO4 from weathering of sulfates |
Na/Cl | 0.00 - 0.30 | Low | No Na-adsorption during freshening and a little silicate weathering |
Mg/Cl | 0.00 - 5.12 | High | Cation-exchange and silicate weathering of sandstones |
Na/HCO3 | 0.00 - 0.57 | Very low | No Substantial weathering of Na-feldspar or other Na-silicates |
Ca/HCO3 | 0.00 - 18.7 | High | Calc-carbonate dissolution or Calc-silicate weathering |
Ca/SO4 | 0.00 - 923 | Very high | Gypsum dissolution present |
Ca/Mg | 0.00 - 53.3 | High | Cation-exchange and weathering of silicate rocks |
Ca+Mg/Na+K | 0.00 - 15.20 | High | Carbonate weathering |
HCO3/∑Anions | 0.00 - 0.07 | High | Weathering reactions and input of dissolved species in recharge area |
NO3/∑Anions | 0.00 - 2.5E−3 | Very low | No anthropogenic contribution |
SO4/∑Anions | 0.00 - 4.4E−3 | Very low | No oxidation of sulphides |
Mg/Ca | 0.02 - 0.75 | Low | Weathering of Silicate rocks |
Na/Na+Cl | 0.01 - 1.00 | High | Sodium source other than halite-albite, ion exchange |
Mg/Ca+Mg | 0.02 - 0.43 | High | Dolomite dissolution, calcite precipitation |
Ca/Ca+SO4 | 0.89 - 1.00 | High | Calcium source other than gypsum |
Ca+Mg/SO4 | 2.96 - 1134.25 | High | No dedolomitization |
Na+K−Cl/Na+K−Cl+Ca | −4.49 - 13.28 | High | Plagioclase weathering unlikely |
Cl/∑Anions | 0.00 - 0.06 | Low | Rock weathering |