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Edward · 05-26-2004, 07:59 PM

gpodio

Thanks for the shortcut. I followed the article http://www.thekrib.com/Plants/CO2/kh-ph-co2-chart.html and have done few experiments to realize later that the equation is probably wrong.

log(CO2) = pH(a) - pH(t) - 0.3

example 1
pH(a) 8, pH(t) 7, takes 5 ppm CO2

example 2
pH(a) 7, pH(t) 6, takes 5 ppm CO2

It is clear that this is wrong. From CO2/KH/pH chart http://www.eheim.com/technik_co2_dauertest.htm we can see it takes 10x more CO2 at 6 pH then at 7 pH.

I am hoping to find more options to measure CO2 levels.

Thank you,
Edward

05-26-2004, 07:59 PM	#7 (permalink)
Edward Moderator Join Date: May 2004 Location: at home Posts: 2,019 iTrader Ratings: 0 Plant Points: 103005	gpodio Thanks for the shortcut. I followed the article http://www.thekrib.com/Plants/CO2/kh-ph-co2-chart.html and have done few experiments to realize later that the equation is probably wrong. log(CO2) = pH(a) - pH(t) - 0.3 example 1 pH(a) 8, pH(t) 7, takes 5 ppm CO2 example 2 pH(a) 7, pH(t) 6, takes 5 ppm CO2 It is clear that this is wrong. From CO2/KH/pH chart http://www.eheim.com/technik_co2_dauertest.htm we can see it takes 10x more CO2 at 6 pH then at 7 pH. I am hoping to find more options to measure CO2 levels. Thank you, Edward