Measurement of the Volatility of GeCl sub 4 and HCl at 20 deg C from Concentrated Aqueous Solutions of GaCl sub 3 and HCl

摘要

The volatilities of GeCl sub 4 and of HCl from concentrated aqueous solutions of GaCl sub 3 and HCl have previously been measured at temperatures varying from 30 deg C to 60 deg C. In order to estimate these volatilities at 20 deg C, the ambient temperature of the tank building at the underground Gran Sasso Laboratory, these results have been extrapolated to this lower temperature. However, the measurements at the other temperatures are two few in number to define adequately the GaCl sub 3 and HCl concentrations with maximum GeCl sub 4 volatility. Also, the extrapolation is uncertain. Because of the importance to the Gallex experiment of defining the region of maximum volatility of GeCl sub 4 so that the optimum solution composition may be used in the solar neutrino experiment, we have performed a systematic study measuring the volatilities of GeCl sub 4 and HCl at 20 deg C from aqueous solutions of GaCl sub 3 and HCl. Although the conditions of measurement are not identical to those of the full scale experiment, all of the measurements were performed in the same way and the derived values relative to each other should have meaning. For purposes of relating these measurements to the BNL pilot tank measurements, the GaCl sub 3 -HCl solution used in the BNL pilot tank was included in the present measurements. 7 figs., 3 tabs. (ERA citation 13:022180)