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A mass spectrometer method for determining helium in the parts-per- million to 10-percent range.
Amarillo, TX: U.S. Department of the Interior, Bureau of Mines, RI 9359, 1991 Jan; :1-15
The U.S. Bureau of Mines has developed a mass spectrometer method for determining helium in the parts-per-million to 10-pct range to an accuracy of +/-1 pct. The method employs a mass spectrometer, an inlet system utilizing a chromatographic gas-sampling valve, and an activated coconut charcoal trap cooled with liquid nitrogen. Gravimetrically prepared standards of helium in nitrogen were used to demonstrate the linearity of the method over the concentration range of 10 ppm to 10.66 pct helium.
Helium-isotopes; Mass-spectrometers; Numerical-analysis; Standards; Helium-4; Mass-spectroscopy; Chemical-analysis
IH; Report of Investigations
NTIS Accession No.
City, ST: U.S. Department of the Interior, Bureau of Mines, RI 9359
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division