All mixtures were prepared by weight from degasified solvents
with accuracy 0.001 g. The volume of solution for density
measurement was about 200 ml. The total uncertainty of mixture
preparation did not exceed 4105 m.f. The solutions preparation
and density measurements were carried out without contact of
the mixtures with atmospheric air. For all measurements only makeup
solutions were used. Because of TBA freezing over temperature
and pressure range under investigation the measurements
were made at limited state parameters.