I have data of pH and total alkalinity of water sample and I want to get bicarbonate value from it.
Thank you @Pankaj.
Actually I want to calculate the concentration of bicarbonate from the concentration of Total alkanity and pH i.e., if there is any equation or emperical formula for clculation then please share.
It can be calculated exactly but the method depends a bit on the conditions of the water.
- Do you know that alkalinity is only found as carbonate and bicarbonate? (no silica, borate and other unusual chemicals in solution)
- Do you know if the water is in equilibrium with CO2 in the atmosphere?
- Which pH range are you in? (at 6-9 it is easier)
Kindly find attached.
Here P is Phenolpthalein Alkalinity
and T is Total Alkalinity.
About the rest of the water chemistry. Where are your samples from? River, groundwater etc.
please refer to this link
https://en.wikipedia.org/wiki/Alkalinity
Simplified summary.
Alkalinity roughly refers to the amount of bases in a solution that can be converted to uncharged species by a strong acid.
measures the ability of a solution to neutralize acids to the equivalence point of carbonate or bicarbonate. The alkalinity is equal to the stoichiometric sum of the bases in solution
the total alkalinity = bicarbonate and the value of bicarbonate become zero when pH = 4.5 because at this point, all the bases of interest have been protonated to the zero level species.
author, James Drever
If it is your main buffer you can use a simple charge and mass balance to calculate the concentration of both species.
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