I am getting high Ca and Hardness values in river waters in Winters. Was just thinking if it could be attributed to snow abrasion with limestone lithology!!
Dear Mr. Rashid,
Calcium carbonate itself is sparingly soluble in pure water. In the presence of dissolved carbon dioxide, however, the solubility increases by more than a hundred times. This effect causes the weathering of limestone, while the readily soluble calcium bicarbonate Ca (HCO 3) 2 forms.
The reversal of this release operation, removal of carbon dioxide by increasing the temperature, thanks to the most natural deposits of calcium carbonate their origin. The complicated mechanism that is visible on some waterways, such as in the chalk terraces in Pamukkale (Turkey), is defined by the limestone - carbonic acid equilibrium.
At low temperatures (for example in the presence of ice) large amounts of carbon dioxide dissolved in the melt water. Upon contact with limestone, the easily soluble calcium bicarbonate Ca (HCO 3) 2 forms, the Hardness in the water increase.
Best regards,
G. Grundmann
The winter discharge is appreciably low when compared to spring, summer or autumn. I personally think it could be a combination of both these reasons in addition to snow abrasion.
Thank you @Y. Jun Xu
@Guenter Grundmann
for your suggestions/reasoning
If you have discharge data, you could make a mass transport calculation for each season to see if there is a significant difference. If you have measurements on other elements such as Mg, Sr, Ba, and Li, you may consider to compare ratios of the elements to Ca among the different seasons.
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