To: Aquatic-Plants at actwin_com
Subject: Re: CO2/pH
From: psears at emr_ca (Paul Sears)
Date: Fri, 22 Mar 1996 08:37:13 -0500 (EST)
In-Reply-To: <199603220839.DAA04613 at looney_actwin.com> from "Aquatic-Plants-Owner at ActWin_com" at Mar 22, 96 03:39:02 am
> From: krandall at world_std.com (Karen A Randall)
> Subject: Plants, CO2/O2 etc.
> I have also noted that
> without any addjustment to my CO2 flow, the pH in my tanks only
> varies by about .2 during a 24 hour period. I often wondered why
> the pH didn't drop more if CO2 continued to be pumped into the
> tank, and the plants stopped using it.
A pH change of 0.2 implies a change in the CO2 concentration
of a _factor_ of 1.58. This could involve an absolute change that is
quite large if you have a CO2 concentration that is in the range one
usually sees when CO2 addition is being used.
(log(1.58) = 0.2)
Paul Sears Ottawa, Canada