title: Deuterium exchange during acid-demineralisation.
abstract: Isotopic analyses of residues prepared by demineralisation of the Murchison meteorite using D-labelled reagents provide evidence for measurable exchange of H-isotopes between residue and reagents.  Precise quantification of this effect is precluded by substantial inhomogeneity of the meteoritic organic matter.  A conservative estimate of the degree of exchange is 3 to 5% of the H pyrolysable as H2O.  This could affect the shape of the curve defining D-release as a function of temperature, but does not change conclusions previously drawn concerning the nature of the bulk D-enrichment of insoluble organic matter in meteorites.
authors.affiliation: Institute of Geophysics, University of California, Los Angeles 90024, USA.
authors.forename: J F
authors.initials: JF
authors.lastname: Kerridge
authors.forename: S
authors.initials: S
authors.lastname: Chang
authors.forename: R
authors.initials: R
authors.lastname: Shipp
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D003903:Deuterium / Q000737:chemistry*; D055593:Geological Phenomena; D005844:Geology; D006859:Hydrogen / Q000737:chemistry*; D007554:Isotopes; D019110:Meteoroids; D014867:Water / Q000737:chemistry*
chemical_list: D007554:Isotopes; D014867:Water; D006859:Hydrogen; D003903:Deuterium