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calculating sodium for water profile - can it be done?

justinopolis

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So.. I received a water report from Murphy & Son, but it doesn't provide an amount for sodium. Is it possible to calculate the sodium from the other values? These are:
Ca 15.12ppm, Mg 2.24ppm, SO4 11.24ppm, Cl 20.5ppm and HCO3 53.68ppm.
I'm guessing not.. Does anyone know of a lab that does provide the sodium value? Thanks in advance!
 

Oginme

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So looking at the anion to cation balance, your water would need to contain somewhere between 6 ppm to 28 ppm of cation to balance out the ionic content.  I would start by estimating the sodium level at 17 ppm (average of high and low).  Since the overall mineral content is fairly low, it will not drag you too far out of target range if you are off my a few ppm.  This will at least get you started until you find another lab to fill in the blank and confirm the other numbers.

 
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