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Re: [APD] CO2 Measurement Method
I too have several largish pieces of bogwood in there which initially
leached some degree of tannins (as evidenced by a yellowish tinge to the
water, removed with carbon). They've been in there for quite a while now
and the water remains clear.
Fish may still be the best CO2 measurement devices but I can't find
> I also have a couple of small "driftwood" pieces, which I boiled
> thoroughly before using. I got lots of brown water during several
> cycles of boiling. It is possible that tannins are being leached out
> there too. Do any of our chemists have an opinion? Will tannins give
> us a low PH reading and make it look like we have more CO2 than we
> really have?
> When my KH/PH readings said I had 70 ppm CO2 I still had some BBA, so
> jacked up the CO2 even more - still no fish distress. Now I have no
> visible BBA - just some diatoms and a bit of hair algae, which I keep
> removing. My kingdom for a simple, foolproof CO2 meter!!
> Vaughn H.
> On Tuesday, January 31, 2006, at 12:09 PM, Rory O'brien wrote:
> > I'm suffering similar confusion Vaughn; the other night my KH
> > 6.5
> > and my (electronically tested) pH was 6.4, suggesting a CO2 level of
> > around 77ppm. Live and apparently happy fish would suggest otherwise
> > but
> > there's no other buffering going on (that I'm aware of). I have
> > dialled it
> > back some anyway.
> > Quoting Vaughn Hopkins <hoppycalif at yahoo_com>:
> >> I have a cork wall in my 29 gallon tank. I also have been
> >> 150 - 250 ppm CO2 using PH/KH table. Being somewhat dim witted it
> >> taken far too long for me to connect those two facts. Apparently
> >> leaches tannins into the water which drops the PH a bit, making the
> >> PH/KH/CO2 table inaccurate. Today I checked a water sample taken
> >> the tank last night and allowed to sit over night vs. one taken
> >> morning. Last nights sample had KH of 9 degrees, PH of 7.0 - 27
> >> CO2. Todays fresh sample had KH of 9 degrees and PH of 6.2 - 170
> >> CO2. I think this strongly indicates that the cork is fouling up
> >> the
> >> CO2 measurement. But, the .8 drop in PH should mean my actual CO2
> >> about 25 - 30 ppm, which the fish and plant reactions say it should
> >> be.
> >> Any comments?
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