title: Temperature-dependent characteristics of Teflon membranes used in mass spectrometry.
abstract: In vitro information is provided on the gas partial pressure/temperature relationship and on the membrane permeability/temperature relationship, when a special type of Teflon membrane is used with a mass spectrometer. Monitored pressures of oxygen, nitrogen, and carbon dioxide in an equilibrating gas mixture decreased with stepwise decreases in temperature from 37 to 18 degrees C. Permeability of membranes to all gases also decreased with decreasing temperature. Observed partial pressure changes were apparently due to temperature-induced changes in Teflon membrane permeability characteristics.
mesh_terms: D002245:Carbon Dioxide; D013058:Mass Spectrometry; D008567:Membranes, Artificial; D009584:Nitrogen; D010100:Oxygen; D010313:Partial Pressure; D010539:Permeability; D011138:Polytetrafluoroethylene; D013696:Temperature
chemical_list: D008567:Membranes, Artificial; D002245:Carbon Dioxide; D011138:Polytetrafluoroethylene; D009584:Nitrogen; D010100:Oxygen