Standard Reference Materials: Analysis of Interlaboratory Measurements on the Vapor Pressures of Cadmium and Silver (Certification of Standard Reference Materials 746 and 748).

摘要

Standard Reference Materials 746 (cadmium) and 748 (silver) which were used for the measurements have been certified over a range of pressures and temperatures. The heats of sublimation at 298K and the associated two standard error limits for cadmium and silver are 26660 plus or minus 150 cal/mol and 680.0 plus or minus 300 cal/mol, respectively. Estimates of uncertainty have been calculated for the certified termperature pressure values as well as for the uncertainties expected from a typical single laboratory's measurements. The statistical analysis has also been made for both the second and third law methods, as functions of both the heat of sublimation and the temperature.