http://worldcat.org/entity/work/id/33556598

Primary standards and standard reference materials for electrolytic conductivity

This report describes the principles and methods for measuring the electrolytic conductivity of primary standards and NIST Standard Reference Materials (SRMs). There are two methods for measuring conductivity: the direct current (DC) method, and the alternating current (AC) method. NIST has redetermined the conductivity of the primary standards, and determined a set of molatity-based primary standards over a temperature range of 0 ̊to 50°C. The conductivities of the primary standards were determined using two uniquely designed conductivity cells for measuring resistance with the AC and DC methods. The primary standards are used to determine the cell constants of conductivity cells. In our laboratory, we used both Jones and Daggett cells for measuring conductivity. NIST issues a set of Standard Reference Materials (SRMs) available in nomimal conductivity values of 5 [micro]S/cm, 15 [micro]S/cm, 25 [micro]S/cm, 100 [micro]S/cm, 500 [micro]S/cm, 1,000 [micro]S/cm, 10,000 [micro]S/cm, and 100,000 [micro]S/cm. The certified conductivity values for the SRMs include the solvent conductivity.

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