4°Kh reference solution

KeithS

Junior Poster
Jan 28, 2007
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East Lothian Scotland
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
 

Tom Barr

Founder
Staff member
Administrator
Jan 23, 2005
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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
 

George Farmer

Lifetime Members
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Sep 6, 2006
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Stamford, Lincs, UK
Message from Aqua Essentials

Message from Richard, Aqua Essentials

OK guys

Many of you have been having problems with your 4dkh solution that I have been selling and here's why.

I was sent the wrong ppm from the lab :?: :!: :shock:

Anyone who has purchased it has a solution that is 1.6 kh.

So here's my proposal. Anyone who has purchased from me, please drop me an email to [email protected] stating your order number when you initially purchased.

When the new stock comes in, I'll send you out the 4dkH solution plus a free bromo blue to say sorry for the inconvenience.

I hope to have the new solution early part of next week.

Once again sorry for the confusion but I hope this puts things right :)

Richard

P.S I would appreciate it if others who frequent other forums could post this message
 

Dave Spencer

Prolific Poster
Jan 9, 2007
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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.
 

Voo

Junior Poster
Apr 6, 2007
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1
Anyone know which Ph indicators can be used with this solution?
Aquaessentials said the bromo blue indicators, but which are they?
 

Voo

Junior Poster
Apr 6, 2007
9
0
1
I have the API Freshwater testkit.
Is the pH indicator solution (low range) in this ok?
 

Dave Spencer

Prolific Poster
Jan 9, 2007
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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.
 

Voo

Junior Poster
Apr 6, 2007
9
0
1
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
 

VaughnH

Lifetime Charter Member
Lifetime Member
Jan 24, 2005
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Sacramento, CA
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.