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pH Calibration

At 03:48 PM 4/20/99 -0400, S Wong asks:
>Can you use distilled water to calibrate a pH meter at 7?
Not reliably.   While theoretically you could, any trace of a contaminant
could move the pH a bunch.  So you are better off using a phosphate buffer
that is pretty stable at 7.0

While I am a foe of Hach's high prices, their buffer solution pillows are
very fairly priced and worth the money easily.   Go for it.   You get ten
pillows for a couple of bucks.

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com