Molality-Based Primary Standards of Electrolytic Conductivity

摘要

New values of electrolytic conductivity were determined for solutions with molality values of 0.01, 0.1, and 1.0 mol/kg KCl in the temperature range 0 to 50°C, at 5°C intervals. Expanded uncertainty values, 2u_(c), 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 non-standard 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.