Re: [APD] CO2 drop checker

[Vaughn Hopkins <hoppycalif at yahoo_com>]

Nothing requires the "drop checker" to be a tiny little thing.  So,  
it wouldn't be hard to design one that was big enough and had a  
sealed port at the top for a pH probe.  It wouldn't need to be  
transparent, so a plastic would work fine.  Sit down at the drafting  
board and see what you can come up with!

Vaughn H .

On Oct 17, 2006, at 10:44 AM, Jerry Baker wrote:

> Vaughn Hopkins wrote:
>> The problem is that measuring the pH and KH of the tank water doesn't
>> tell you how much CO2 is in the tank water.  That water almost always
>> contains some other sources of alkalinity and acidity besides CO2, so
>> the equation relating pH/KH/CO2 isn't applicable.  The "drop checker"
>> lets us get around that problem by using distilled water with just
>> sodium bicarbonate in it as a test solution.   I have no idea how
>> well the Phenol Red would work in this device, or how easy it is to
>> discriminate between orange and yellow orange or reddish orange.
>> But, trying it out wouldn't be terribly expensive.  I suspect that
>> the "high range" pH test kits may use Phenol Red and would be a good
>> thing to experiment with too.
>
> What might be *really* interesting to those of us who appreciate
> precision for precision's sake is figuring out a way to get a pH probe
> into that distilled water.
>
>
> -- 
> Jerry Baker
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