Ionic ratio

Wet

Dry

Comment

Interpretation

SO₄/Cl

0.06 - 1.62

0 - 3.15

high

Additional sources of SO₄ from weathering of sulfates

Na/Cl

0.00 - 0.04

0 - 0.21

low

No Na-adsorption during freshening and a little silicate weathering

Mg/Cl

0.04 - 0.67

0 - 4.84

high

Cation-exchange and silicate weathering of sandstones.

Na/HCO₃

0.00 - 0.04

0 - 0.05

high

Substantial weathering of Na-feldspar or other Na-silicates

Ca/HCO₃

0.00 - 1.80

0 - 2.60

high

Calc-carbonate dissolution or Calc-silicate weathering

Ca/SO₄

0.00 - 4.00

3.84 - 61

high

Gypsum dissolution present

Ca/Mg

0.00 - 13.48

0 - 7.66

high

Cation-exchange of weathering of silicate rocks.

Ca + Mg/Na + K

0.00 - 7.55

0.00 - 38.48

high

Carbonate weathering

HCO₃/∑Anions

0.00 - 0.11

0.00 - 0.08

high

Weathering reactions and input of dissolved species in recharge area

NO₃/∑Anions

0.00 - 0.01

0.00 - 0.00

very low

No anthropogenic contribution

SO₄/∑Anions

0.00 - 0.01

0.00 - 0.01

very low

No oxidation of sulphides.

Mg/Ca

0.00 - 2.29

0.00 - 4.84

low

Weathering of Silicate rocks

Na/Na + Cl

0.00 - 0.04

0.01 - 1.00

high

Sodium source other than halite-albite, ion exchange

Mg/Ca + Mg

0.07 - 1.00

0.12 - 0.7

high

Dolomite dissolution, calcite precipitation or saltwater

Ca /Ca + SO₄

0.00 - 0.86

0.46 - 1.00

high

Calcium source other than gypsum

Ca + Mg/SO₄

0.39 - 11.30

0.00 - 675

Na + K ? Cl/Na + K ? Cl + Ca

0.10 - 1.00

−0.61 - 0.61

high

Plagioclase weathering unlikely

Cl/∑Anions

0.00 - 0.16

0.00 - 0.04

low

Rock weathering