Na/(Na + Cl)

Conclusion

Number of samples

<0.5, TDS > 500

Reverse Softening, seawater

7

<0.5, 50 < TDS < 500

Analysis Error

0

<0.5, TDS < 50

Rainwater

0

>0.5

Sodium source other than halite-albite, ion exchange

0

0.5

Halite solution

10