On Tue, 7 Oct 2003 18:12:25 UTC, "Rick" wrote:


"Tasslehoff" wrote in message
u...
I think it's usually stored in Ph 4 solution and KCl(Potassium chloride)
sold in gardening/hydoponics as potash. DO NOT use K2SO4(Pottasium
sulphate) also labelled as potash depending on the brand.



I have a Hanna Instruments PH tester and my instructions are to store in PH
7 solution. You should check the manufactures specifications for your
particular unit .

I once Googled the subject pretty widely and found a bunch of
recommendations including those of some reputable suppliers. The favorite
seems to be 4-molar KCl. That's 300 grams (298 would be quite
unnecessary accuracy) in one liter of solution. pH 7 buffer is also
suggested, and pH 4 also.


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