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4°Kh reference solution

Discussion in 'UK Aquatic Plant Society' started by KeithS, Apr 10, 2007.

  1. KeithS

    KeithS Junior Poster

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    Hi all
    Been reading a couple of threads both on here and another forum and was wondering is there anywhere in the UK to buy a made up reference solution as it seem the DIY way is a bit hit and miss or at least a bit trouble some to make.

    Keith
     
  2. Fred Dulley

    Fred Dulley Junior Poster

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    Richard from Aqua Essentials will have some in shortly. The lab sent 1.6°Kh previously instead of the ordered 4°Kh.
     
  3. Tom Barr

    Tom Barr Founder
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    Thatv issue should be resolved and was not the fault of AE, he had ordered the 25,000ppm and got 10,000ppm as well as the 25,000ppm, so that gave an error when diluting.

    Anyway, mystery solved, we had no such issues here, but they did not swap the 10K for 25 K either..............

    Regards,
    Tom Barr
     
  4. George Farmer

    George Farmer Lifetime Members
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    Message from Aqua Essentials

    Message from Richard, Aqua Essentials

     
  5. Dave Spencer

    Dave Spencer Prolific Poster

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    I can bring along some free 4dKH to any get togethers. I have the means to make a pretty accurate batch of the stuff.

    Dave.
     
  6. George Farmer

    George Farmer Lifetime Members
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    Sounds good, Dave. Thanks.
     
  7. Voo

    Voo Junior Poster

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    Anyone know which Ph indicators can be used with this solution?
    Aquaessentials said the bromo blue indicators, but which are they?
     
  8. George Farmer

    George Farmer Lifetime Members
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    I use the Nutrafin low-range pH kit reagent.
     
  9. Voo

    Voo Junior Poster

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    I have the API Freshwater testkit.
    Is the pH indicator solution (low range) in this ok?
     
  10. Dave Spencer

    Dave Spencer Prolific Poster

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    I am not totally sure, but I think that by definition a low pH range reagent will be Bromo Blue. Is your reagent blue from the bottle, and still blue when added to the 4dKH?

    I use the Nutrafin reagent, which is definitely Bromo Blue.
     
  11. Voo

    Voo Junior Poster

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    I havent yet bought the 4dkh solution, i'm trying to find out if my API pH indicator is ok, or if i should buy the nutrafin one at the same time.

    Not sure on the colour, will check it later
     
  12. VaughnH

    VaughnH Lifetime Charter Member
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    API indicator solution is bromothymol blue, which is what is needed for the drop checker. As far as I can find out, all of the indicator solutions for pH that have a color chart ranging from yellow at about pH = 6 to blue at about pH = 7.2 are bromothymol blue, and will work fine in a drop checker. There is no other indicator dye that gives the yellow to blue colors in the range of interest.
     
  13. KeithS

    KeithS Junior Poster

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    Hi all
    Got the solution yesterday and been using the Nutrafin low range ph test solution which seems to work great.
    Keith
     
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