COMMISSION ON ELECTROANALYTICAL CHEMISTRY
Molality-based primary standards of electrolytic conductivity (IUPAC
K. W. Pratt,
W. F. Koch, Y. C. Wu, and P. A. Berezansky
National Institute of Standards and Technology, Gaithersburg,
MD 20899, USA
Abstract: New values of electrolytic conductivity were determined
for aqueous KCl solutions with molalities of 0.01, 0.1, and 1.0 mol/kg
in the temperature range 0 to 50 °C, at 5 K intervals. Expanded
uncertainties, 2uc, were also calculated in accordance
with the presently accepted protocol for the treatment of uncertainty.
The new conductivity values are recommended as primary standards of
electrolytic conductivity based on molality. They replace the previous
values, based on the nonstandard demal scale, which were determined
only at 0, 18, and 25 °C. The accuracy of the technique used was
evaluated by repeating the determination of the previously recommended
demal-based IUPAC standards of electrolytic conductivity and through
comparison with other absolute measurements.
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