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Re: ph-kh-co2

To: Aquatic Plants Digest <Aquatic-Plants at actwin_com>
Subject: Re: ph-kh-co2
From: Michael Eckardt <mike at odg_com>
Date: Thu, 17 Jul 1997 09:27:23 -0400

>The formula is:
>
>	CO2 = 12.839 * KH * 10^(6.37-pH)
>
>With KH in German degrees, CO2 is calculated in mg/l (=ppm).

As an accountant, my math skills don't extend much past debits and credits,
so I need some help. The formula that I derived from a post by Paul Sears a
few months back was this:

	CO2= 10^(7.58-pH+@LOG(KH))

The formulas result in CO2 values that are about 10-20% different. How
come?


Michael Eckardt - mike at odg_com
Ontario Drive & Gear Limited - http://www.odg.com
New Hamburg , ONT - 519-662-2840

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