I did some lab tests on groundwater samples from a coastal delta area and the results shows that the Na/Cl ratio is less than 1 and the TDS is less than 500mg/l. Ratio of less than 1 implies that Cl > Na in meq/l.
It looks strange to me, I just need to know whether I am on the right path.
In addition, to the problem statement, 50mg/l < TDS < 500mg/l
Well,
You are in right path,
this ratio found in rain water, where rain water come from sea water and the ratio is less than one, here you are dealt with coastal region affected by sea water, also you remember the ion exchange, probably sodium concentration decreased due to ion exchange mechanism when the sediments dominantly high clay contents.
Sincerely
'Na' can be from ion-exchange processes or silicate weathering. The Na/Cl ratios in groundwater gives an indication of the sources of these ions in groundwater. If the Na/Cl ratios are generally greater than 1 , it suggests the sodium sources other than halite and therefore from ion exchange reactions, and if it is less than 1 it may be due to sea aerosol spray specially in Rain water near coastal area or due to seawater intrusion. Also this indicates the high Chloride values due to salt dissolution from the soil or mixing of waste water with ground water.
I agree with Srivastava comment ' The Na/Cl ratios in groundwater gives an indication of the sources of these ions in groundwater. If the Na/Cl ratios are generally greater than 1 , it suggests the sodium sources other than halite and therefore from ion exchange reactions, and if it is less than 1 it may be due to sea aerosol spray specially in Rain water near coastal area or due to seawater intrusion"
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