H isotope fractionation due to hydrogen-zinc reactions and its implications on D H analysis of water samples

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Abstract

After conversion of water to H2 gas with zinc for D H ratio determination, hydrogen gas can be absorbed by the zinc during cooling, resulting in H isotope fractionation. Thermal release and subsequent D H ratio determination of hydrogen bound to zinc revealed that the fractionation between the bound H and the H2 gas is extremely large with an empirical α-value of ∼ 1.62. Differences in the fractionations observed using stopcock-sealed vessels and break-seal tubes indicate that the conversion method and H2 Zn ratios should be the same for both samples and standards. The effect of hydrogen absorption can be eliminated (or lowered) by re-heating the zinc during transfer of hydrogen gas into the mass spectrometer. For measurement of hydrogen isotope composition of geological samples with varying and sometimes unpredictable water content (e.g., fluid inclusions of minerals) recording a calibration curve of varying water/zinc ratios and δD-values is proposed.

Original languageEnglish
Pages (from-to)19-25
Number of pages7
JournalChemical Geology
Volume121
Issue number1-4
DOIs
Publication statusPublished - Apr 5 1995

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Fractionation
Isotopes
Zinc
Hydrogen
fractionation
zinc
hydrogen
isotope
Gases
Water
gas
water
hydrogen isotope
Mass spectrometers
Water content
fluid inclusion
Seals
Minerals
vessel
spectrometer

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology

Cite this

H isotope fractionation due to hydrogen-zinc reactions and its implications on D H analysis of water samples. / Demény, A.

In: Chemical Geology, Vol. 121, No. 1-4, 05.04.1995, p. 19-25.

Research output: Contribution to journalArticle

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