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- NBS (NIST) Buffers
The use of pH 6 to calibrate offset of pH meters at 6.86 was
commonplace not that long ago. This buffer provided better accuracy
but was known to be less stable. The introduction of microprocessors
into pH meters eliminated calibration trimmers and screwdrivers by
automatically recognizing buffers. Yet, this meant that in most cases
the microprocessor was not able to distinguish between pH 6.86 and
7.01. As a result the former was dropped in favor of pH 7.01. Hanna
has brought this important buffer back into modern pH meters by
offering microprocessor portable and bench meters such as HI 9625, HI
9321 & pH 300, which can be calibrated at 6.86 as well as pH 7.01.
The range of Hanna pH 6 buffers has been extended and the stability
greatly enhanced to match that of pH 7.
- NIST Traceability pH 6 buffer is
standardized with a pH meter that is calibrated to NIST buffer
solutions. The ingredients are Potassium Dihydrogen Phosphate and
Disodium Hydrogen Phosphate and the buffer is traceable to NIST 186Ie
and 186IIe S.R.M.
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