Electrical conductivity measurements of aqueous boric acid at 25--350(degree)C at saturation vapor pressure. Final report

摘要

Electrical conductance measurements of aqueous boric acid solutions (15-110 g/kg-H(sub 2)O (equivalent to) 0.251--1.815 mol/kg-H(sub 2)O) were measured over the temperature range 25 to 75 C at saturation vapor pressures in glass cells with parallel platinum electrodes. Sixteen series of measurements were made involving three samples of boric acid from different sources. Conductance measurements were also made at 15.5 and 30.5 g/kg-H(sub 2)O over the temperature range 100 to 350 C at 50 C intervals with a metallic cell fitted with concentric platinum electrodes. The specific conductances of H(sub 3)BO(sub 3) (aq)were calculated after correction for the conductance of the solvent (water) and are tabulated in this report. At the specific conditions requested in the project description, namely a concentration of 110 g/kg-H(sub 2)O and 65 C, the specific conductance of boric acid is 293.2 (+-) 1.8 microSiemens/cm based on duplicate measurements of four independent solutions. The results from these tests will be utilized by the Tokamak Physics Experimental Project (TPX).