calculating CO2 concentration
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Old 04-01-2003, 11:12 PM   #1
doooog
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okok, i know there are charts and all, and i have found an equation, but it has to be flawed. i am wanting to put it into a spread sheet, so i can have a daily record of my CO2 levels, and what not.

anyway...

Thanks

~Doug
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Old 04-02-2003, 01:41 AM   #2
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Its flawed to the extent of the accuracy of your ph and kh testing. It can also be rendered useless if there are buffers or acids in the tank other than carbonates.

Marcel
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Old 04-02-2003, 03:26 AM   #3
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i'm sorry, i should say that there was an error in it and i was after a corrected equation
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Old 04-02-2003, 03:31 AM   #4
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his equation had 7-pH at the end--> my pH is right around 7 to 7.2 and that results in multiplying by 0 and that isn't cool, and it also give me "high" negative numbers if my pH is 7.2

CO2 (in PPM) = 3 * KH * 10( 7-pH ), is what i found

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~Doug
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Old 04-02-2003, 06:25 PM   #5
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The correct formula is 3.6*KH*10 ^ (7-pH)

I use 3.6, but have seen equations with 3, I'm not sure which one is accurate. By taking 10 to the power of (7-pH), it is impossible to get negative numbers or multiply by 0. Hope this helps!

-Tim
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Old 04-02-2003, 06:40 PM   #6
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Heck if you don't want to calculate bookmark this page!

http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm

Felix
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Old 04-02-2003, 09:04 PM   #7
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you see kor4ever, i was attempting to avoid having to go to a website every time i wanted to calulate this, this way all i have to do is type in my Kh and pH values, and then i have the calulation done for me.

And A BIG thanks to Tim

~Doug
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Old 04-02-2003, 10:52 PM   #8
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I have been trying to do the same thing! I must be to thickheaded to understand tho. I hope you get a good answer so I can use it too!
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Old 04-02-2003, 11:29 PM   #9
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it worked
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