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dc.contributor.authorStanley, Rachel H. R.
dc.contributor.authorBaschek, Burkard
dc.contributor.authorLott, Dempsey E.
dc.contributor.authorJenkins, William J.
dc.date.accessioned2010-04-21T19:08:41Z
dc.date.available2010-04-21T19:08:41Z
dc.date.issued2009-05-29
dc.identifier.citationGeochemistry Geophysics Geosystems 10 (2009): Q05008en_US
dc.identifier.urihttp://hdl.handle.net/1912/3296
dc.descriptionAuthor 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.abstractA 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.sponsorshipWe 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.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttp://dx.doi.org/10.1029/2009GC002429
dc.subjectNoble gasen_US
dc.subjectOceanographyen_US
dc.subjectMass spectrometryen_US
dc.subjectSeawateren_US
dc.subjectIsotopeen_US
dc.subjectCryogenicen_US
dc.titleA new automated method for measuring noble gases and their isotopic ratios in water samplesen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2009GC002429


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