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Re: CO2 table and phosphate
- To: Aquatic-Plants at actwin_com
- Subject: Re: CO2 table and phosphate
- From: Paul Sears <psears at nrn1_NRCan.gc.ca>
- Date: Thu, 13 Dec 2001 17:53:36 -0500 (EST)
- In-Reply-To: <200112132048.fBDKm5o24681 at actwin_com> from "Aquatic Plants Digest" at Dec 13, 2001 03:48:06 PM
> From: "Rachel Sandage" <rachelsor at hotmail_com>
> Subject: CO2 table & Phosphate
> Hi all,
> I am using the pH/KH table at
> http://www.thekrib.com/Plants/CO2/kh-ph-co2-chart.html to determine the
> level of CO2 in my tank. I notice, though, that it says "The CO2-KH-pH
> equilibrium should be correct
> unless you are taking extreme measures to adjust pH, such as adding
> lots of phosphate buffers like pH-UP or pH-DOWN or using sulfuric
Sulphuric acid doesn't cause a problem - it's a strong acid
and just destroys KH. Weak acids make it impossible to _measure_ KH.
> Now I do add some phosphate to my tank - maybe a BB-sized ball of
> KH2PO4 weekly. Will this change my readings?
It's the total amount there that matters - if you have a few ppm
or less, it isn't going to cause a problem at KH 5.
Paul Sears Ottawa, Canada