A new experimental technique to study supercritical fluid phases at conditions up to 550°C and 5 kbar
Lüttge, Andreas; Metz, Paul; Schulz, Reiner; Walker, Nοrbert
European Journal of Mineralogy Volume 10 Number 2 (1998), p. 385 - 390
published: Mar 31, 1998
manuscript accepted: Jan 19, 1998
manuscript received: Dec 16, 1997
ArtNo. ESP147051002013, Price: 29.00 €
Abstract A new experimental technique is presented that combines a high pressure, high temperature vessel with an ultra-high vacuum chamber (10-10 mbar). A quadrupole mass-spectrometer is used in combination with an open crossbeam ion source for measurements of a molecular beam of supercritical fluid "leaked" through a custom-built high-temperature needle valve. In general, the technique allows for the study of the composition of supercritical fluids that have or have not interacted with solid phases such as minerals, glass, or metals. Experimental studies can be carried out in a pressure-temperature range of up to 5 kbar and 550°C. Three spectra are presented that show the results of measurements of pure CO2-H2O fluids and of a mixed CO2-H2O fluid which was in contact with silica gel.