Re: [APD] Using KH reference solutions to measure CO2

["Terry Barber" <terbarb at alltel_net>]

Tom,

What kind of membrane are you using?  Silicone?     You might also want to
try a polypropylene one.   The PP is hydrophobic...the pores will be filled
with air.........diffusion is then through the tiny air gap in the membrane
pore to the ref solution.   Wonder which is faster?  I used to work for an
outfit that makes them.......may be hard to get a sample however.....I still
know a couple of people there if you need a contact.

TerryB

----- Original Message ----- 
From: "Thomas Barr" <tcbiii at yahoo_com>
To: <aquatic-plants at actwin_com>
Sent: Friday, December 01, 2006 5:40 PM
Subject: [APD] Using KH reference solutions to measure CO2


> Well, I recieve the gas permeable membranes today and slapped
> one on my pH probe and added a KH of 4.0 ref solution of DI and
> baking soda(lab grade). It slips on easy and the rubber O ring
> is pretty tight so I do not expect any leaking of tank water
> inside. I added the KH ref solution and then squeezed the air
> out so there was nothing but KH solution inside before sealing
> the O ring over the tip.
>
> I added 3 mls of solution to the tip/membrane.
>
> I placed this into my tank and measured the CO2.
> It took 15 minutes for the reading to stabilize.
> Not bad.
>
> Once the reading on the pH meter is stable, then you take the
> reading. This time to stablization is key to determining the
> response time.
>
> I'll do a photo set later next week.
>
> Regards,
> Tom Barr
>
> www.BarrReport.com
>
>
>
>
>
>
>
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