The sources of silica in groundwater is the silica-containing soil profile but the question is its percentage.
Kindly see the following RG discussion thread.
https://www.researchgate.net/post/Factors_responsible_for_dissolved_silica_content_in_groundwater
All silicate minerals except quarts disintegrate rather easily consuming acidity (e.g. from rain) and releasing silica, e.g. K-feldspar:
KAlSi3O8 + 1,xH+ + 7H2O = K+ + 0,x Al(OH)2+ +(1-X)Al(OH)3 + 3 H4SiO4
Chemical kinetics of mineral weathering is a useful starting point (Lasaga, 1984). Weathering of primary silicate minerals but also their regulation but subsequent processes such as precipitation and ion exchange are also important.
Dear Saha,
Several sources can be thought for the concentration of silica in groundwater. Water-rock interactions are the most important one. By The interaction of groundwater with surrounding rocks and soil, different silica species may add to the waters. This reaction depends on the other parameters such as temperature and pressure. The mixing of thermal waters with high amounts of silica content is also important and may increase the silica concentration.
Regards,
Rahim
Amorphous , chalcedony silica is mildly soluble in water. If ground water aquifer lying in deeper depth probability of silica become more. Most of the worm/ hot springs are enriched in SiO2.
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