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Re: [APD] Estimative Index for CO Dosing - Bah!

If I assume that water in equilibrium with the atmosphere will have about 3 ppm CO2 in it, the equation for CO2(ppm) can be changed to: CO2=3*10exp(7-PH)*10exp{PH(for overnight rested sample)-7}. And, this reduces to CO2=3*10exp(change in PH from equilibrium sample to tank sample). Therefore, to get 30 ppm, the increase in PH for the sample sitting overnight would be 1.0. And, calculating ppm CO2 for various changes in PH gives this chart:

Vaughn H.

On Wednesday, March 8, 2006, at 10:54 AM, Jerry Baker wrote:

All you
are really doing is measuring a known quantity of CO2 and then adjusting
the curve of the KH/pH/CO2 relationship to match observations. It
doesn't change anything.

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