Metrohm 914 pH / Conductometer - Manual (Page 76)

7.1 Saved buffer series
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pH Meter/Conductometer
7 Appendix
7.1 Saved buffer series
The temperature-dependent pH values of the most important commer-
cially available pH buffer solutions are stored in pH Meter/Conductome-
ter instruments for automatic buffer recognition during pH calibration.
In addition to the Metrohm buffer solutions, other reference buffers are
also included in the tables.
CAUTION
Buffer quality
The precision of pH measurements mainly depends on the correct cali-
bration of the measuring chain. To do so, you should use clean and
fresh buffer solutions. A common cause of incorrect calibration is, for
example, the use of an old pH 10 or pH 12 buffer. The pH value of a
buffer solution may markedly deviate from the certified pH value of a
new buffer solution as a result of the introduction of CO
2
from the air.
The following tables provide an overview of the stored pH(T) series:
NOTE
pH values printed in bold are the values for the reference temperature
of the respective buffer set.
pH values represented in italics are interpolated or extrapolated values.
The other pH values correspond to the manufacturer's specifications.