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Does bromothymol blue affect the reference solution's dKH?

Discussion in 'CO2 Enrichment' started by Richard McConchie, Jun 6, 2016.

  1. Richard McConchie

    Richard McConchie Junior Poster

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    Hi. I'm fairly new to CO2 injection and have been calibrating my 420 litre tank for the last couple of weeks. I have two drop checkers of different design. The first (one of those nicely curved glass units) is mostly blue to blue-green and changes colour only slowly. The second (which is located right next to the first) is a glass sphere with a hollow cylinder stuck into it. It changes relatively rapidly to a bright green to lime green.


    Both are loaded with my home made 4 dKH bicarb solution (17 drops in 20 ml from an API test kit). The only way I can think to resolve the discrepancy is that there may be more bromothymol in the second unit (the design makes the colour less easy to see). I was thinking that if the bromothymol is made up into solution with distilled water it could lower the dKH of the combined (reference + bromo) test solution, and the more bromo you add, the yellower the result at any particular CO2 level.


    Does this sound plausible?
     
    #1 Richard McConchie, Jun 6, 2016
    Last edited by a moderator: Jun 6, 2016
  2. Dennis Singh

    Dennis Singh SynKing!

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    Sorry RM, i don't think anyone knows or they would've chimed in by now.
     
  3. Richard McConchie

    Richard McConchie Junior Poster

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  4. Justlikeapill

    Justlikeapill New Member

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    If you are using the same solution and they are side by side then it is because of the different designs. If I understand your descriptions, the faster one just has less airspace so it reaches a reading faster.


    I would think the type that hangs on the "rim" of an aquarium (a tube that's bent into a U-shape) would be extra slow.
     
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