A dc method for the absolute determination of conductivities of the primary standard KCl solutions from 0-degrees-C to 50-degrees-C

Abstract

A new method for the absolute determination of electrolytic Conductivity based on direct current and potcntio-mctrlc measurements is described. The unique design of the cell uses a removable center section whose length and crosS'Seciional area arc accurately known. Two pairs of matched Ag, AgCI electrodes are used in a four terminal mode of resistance measurement. Measurements of the electrolytic conductivity of primary standard potassium chloride solution using this novel dc conductance cell arc compared with the currently adopted I UP AC and OIML recommendations. In addition^ measurements have been made of the electro-lytic conductivity of a solution of potassium chloride having a molality of 1 mol/lcg (mole KQ per kilogram HiO). The values so obtained over the temperature range of O'C to 50 "C are recommended as the new primary standard:; for electrolytic conductivity.