I have analyzed groundwater of the middle indo-gangetic plain and detected the Na ion concentration (90 mg/L) and Cl ion (1.7 mg/L). Is it possible?
There are waters dominated by sodium and carbonate, for example soda lakes: https://en.wikipedia.org/wiki/Soda_lake A complete analysis of all cations and anions would be clarifying. Alkalinity, the sum of HCO3- and CO32- is a simple analysis, which can show whether there is a connection between alkalinity and sodium.
Yes, the concentration of sodium (Na⁺) can be higher than chloride (Cl⁻) in groundwater. This situation can occur due to various geological, hydrological, and anthropogenic factors that influence the composition of groundwater.
The chloride concentration of 1.3mg/l is very low and so I would check your ionic balance to make sure that is a reliable number. That aside, yes you can have higher sodium than chloride. One quite common setting is where there is cation exchange of calcium for sodium where calcium-rich (e.g. Ca-HCO3) waters interact with sodium-rich clays / mudstones to produce Na-HCO3 waters.
Thank you @ Arne andersen @ Ogel Chemicals @ Nick Rukin for clearing my doubts.
Yes it’s depends on the situation, we may concentrate more on the Na than Cl. It depends on the parameters of groundwater quality in the case study. We have to consider the limitions of the Na and Cl.
Yes, sodium concentration can be higher than chloride in case of groundwater due to many anthropogenic factors like agro chemicals usages etc. Also hydrological and geological factors affect the composition of groundwater.
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