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A device for loading gas and gas mixtures into precious metal sample capsules for use in high-pressure high-temperature instrumentation is now commercially available. The original design of this device was conceived by Boettcher et. al (American Mineralogist, Volume 74, page 1383-1384, 1989) for their studies of the solubility of various gases (Ar, Xe, Kr, N2, C02), in silicate melts. The device uses a standard laboratory vacuum line to evacuate air from the capsule and solid sample, thereby purging airborne contaminates from the system. Through regulation of the gas flow, precise quantities of pure gas or of gas mixtures are loaded into the sample capsule. Traditionally, many gas substances were loaded as liquids or as solid compounds that volatilized or decayed at temperature to release the desired gas phase. Such methods were labor intensive, often inaccurate, and commonly introduced unwanted elements and ubiquitous water to the system. This device allows gas phases to be easily utilized in high-pressure, high-temperature experimentation.
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