A new automated method for measuring noble gases and their isotopic ratios in water samples


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dc.contributor.author Stanley, Rachel H. R.
dc.contributor.author Baschek, Burkard
dc.contributor.author Lott, Dempsey E.
dc.contributor.author Jenkins, William J.
dc.date.accessioned 2010-04-21T19:08:41Z
dc.date.available 2010-04-21T19:08:41Z
dc.date.issued 2009-05-29
dc.identifier.citation Geochemistry Geophysics Geosystems 10 (2009): Q05008 en_US
dc.identifier.uri http://hdl.handle.net/1912/3296
dc.description Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 10 (2009): Q05008, doi:10.1029/2009GC002429. en_US
dc.description.abstract A method is presented for precisely measuring all five noble gases and their isotopic ratios in water samples using multiple programmed multistage cryogenic traps in conjunction with quadrupole mass spectrometry and magnetic sector mass spectrometry. Multiple automated cryogenic traps, including a two-stage cryotrap used for removal of water vapor, an activated charcoal cryotrap used for helium separation, and a stainless steel cryotrap used for neon, argon, krypton, and xenon separation, allow reproducible gas purification and separation. The precision of this method for gas standards is ±0.10% for He, ±0.14% for Ne, ±0.10% for Ar, ±0.14% for Kr, and ±0.17% for Xe. The precision of the isotopic ratios of the noble gases in gas standards are ±1.9‰ for 20Ne/22Ne, ±2.0‰ for 84Kr/86Kr, ±2.5‰ for 84Kr/82Kr, ±0.9‰ for 132Xe/129Xe, and ±1.3‰ for 132Xe/136Xe. The precision of this method for water samples, determined by measurement of duplicate pairs, is ±1% for He, ±0.9% for Ne, ±0.3% for Ar, ±0.3% for Kr, and ±0.2% for Xe. An attached magnetic sector mass spectrometer measures 3He/4He with precisions of ±0.1% for air standards and ±0.14% for water samples. en_US
dc.description.sponsorship We are grateful for support by the National Science Foundation Chemical Oceanography program (OCE-0221247), by the Department of Defense (graduate fellowship to RHRS), and by the Woods Hole Oceanographic Institution (postdoctoral fellowship for B.B.). en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2009GC002429
dc.subject Noble gas en_US
dc.subject Oceanography en_US
dc.subject Mass spectrometry en_US
dc.subject Seawater en_US
dc.subject Isotope en_US
dc.subject Cryogenic en_US
dc.title A new automated method for measuring noble gases and their isotopic ratios in water samples en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2009GC002429

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