Hi,
I'm worried that my opinion on this matter may be in a minority. I truly
hope to be proved wrong. Every bottle of every lot should be tested for pH.
This is especially true if you are doing any reconstituting of the buffers.
I do not know if CAP actually looks for this, but they should considering
all the other seemingly insignificant things they do look for. (Float bath
temps... really?)
If you reconstitute buffers with distilled water, the water pH varies and
hence the buffer pH will vary some with it. Even if you don't and are willing
to spend God knows how much to have ready to use buffer shipped to you, how
sure are you that there is never any fluctuations in the pH from the factory or
due to freezing on the loading docks. It is just a good practice to be 100%
sure about this and it really doesn't take that long to check.
Since checking the pH should be incorporated all the time,why not just
make up the buffers ourselves anyway and save the 400% markup per bottle. (Yes
I actually did the math on that the numbers are right!) So save money and
increase accuracy while ensuring test quality by doing things the good old
fashioned way.
Alright will someone help this crotchety old git off his soapbox,
Amos
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