CO2 Chart question - The Planted Tank Forum
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post #1 of 2 (permalink) Old 09-07-2004, 08:17 PM Thread Starter
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CO2 Chart question

I am using The Lamotte 4491 Alkalinity test kit to measure KH in my aquarium. I am using the results to measure the Co2 in the system using the following calculator and a pH probe,
My problem is that I initially get a reading, and then the color changes as I let the sample sit (as if the Co2 is being gassed off, and my result changes). What I want to know is if I should use the initial reading to determine my Co2, or should I let the sample sit for an hour to measure my Co2?
Also, Chuck's webpage describes PO4 concentrations as a problem. I was wondering at what levels do they become a problem. I maintain 2ppm throughout the week.
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post #2 of 2 (permalink) Old 09-07-2004, 09:12 PM
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I would use the initial reading that you are receiving, since letting it sit around, the CO2 might be gassed off (either through the hole where the titrator is placed or elsewhere). It might be okay if it's sitting for a few minutes, but an hour is a bit too long (how long does it take the solution to change color?).

I'm also assuming that when you say changing color, you're referring to the solution going from blue-green to purple, correct?

Phosphate concentration at your level isn't something to be alarmed about. It's only really a problem when nutrient concentrations/levels are out of wack and you're dealing with chronic bouts of algae.


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