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