The NaHCO3 type of groundwater is mainly derived from ion exchange process. The Na+-,adsorbed to the clay surfaces are successively being replaced by Ca2+-ions in order of increasing affinity for the clay or due to weathering of plagioclase feldspars in the groundwater . Bicarbonate is mainly associated with precipitation and subsurface lithologic characters (particularly limestone aquifer) .some places, mostly in coastal areas the NaHCO3 type indicate paleo marine depositional environment or passing through paleo marine channels Formation of NaHCO3 type of water ? - ResearchGate. Available from: https://www.researchgate.net/post/Formation_of_NaHCO3_type_of_water [accessed Oct 28, 2016].
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