University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Gas

Classification: Gas -> hydrogen

Citations 2

"High-precision Determination Of 2H/1H In Hydrogen And Water By Continuous-flow Isotope Ratio Mass Spectrometry"
Anal. Chem. 1995 Volume 67, Issue 13 Pages 1992-1997
Simon J. Prosser and Charles M. Scrimgeour

Abstract: Simultaneous collection of 1H1H+ and 1H2H+ ions was achieved by using a Europa Scientific 20-20 mass spectrometer (illustrated) modified by having its flight tube 'flared' and an extra collector spur added. A magnetic field of 0.12 T was used with an accelerating potential of 4 kV. The method was applied to H2 gas and to water equilibrated with H2 in the presence of a Pt-on-alumina catalyst. Interference from H3+ could be corrected for by extrapolation to zero ion beam intensity. At natural abundance, isotopes in H2 and water could be determined in 2 min with a precision of ±0.15% and ±0.3%, respectively. No memory effect was observed. The technique should also be applicable to isotopes of C, N, O and S.
Hydrogen-1 Hydrogen-2 Mass spectrometry Isotope ratio Interferences

"High-precision Deuterium/hydrogen Measurement From Hydrogen Gas And Water By Continuous-flow Isotope Ratio Mass Spectrometry"
Anal. Chem. 1995 Volume 67, Issue 14 Pages 2486-2492
Herbert J. Tobias, Keith J. Goodman, Craig E. Blacken, and J. Thomas Brenna

Abstract: Water, injected into Ar (~15-20 cm/s), was passed through a GC coil at 210°C and subsequently through CuO/Pt at 850°C for combustion of organic species and through Ni at ~850°C to reduce water to H2. Any unreduced water was removed with a Nafion trap. H2 (m/z 2) and HD (m/z 3) were monitored simultaneously with a Finnigan MAT 252 MS instrument with multiple Faraday cup detectors, amplifiers and digitizers. Calibration graphs (peak height at ~300 mV) were linear for 1 x 10^-6 to 1 x 10^-2 parts of D2O in tap water. In a second procedure enriched H2 introduced into Ar (~50 cm/s) was brought into contact with a 99.9% Pd foil (0.125 in. diameter x 0.127 mm thick) held at ~330°C. Carrier gas and untransmitted H2 were permitted to flow to waste (illustrated). H2 and DH drawn through the Pd foil passed into the MS instrument via a cryotrap inserted to remove traces of water. The MS source chamber pressure was set at ~0.04 µTorr; other operating conditions were as for the Ar carrier system. Calibration graphs (peak height at ~300 mV) were linear.
Hydrogen-1 Hydrogen-2 Mass spectrometry Isotope ratio