Precise and accurate compound-specific carbon and nitrogen isotope analysis of RDX by GC-IRMS

Faina Gelman, Anna Kotlyar, Daniel Chiguala, Zeev Ronen

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A new analytical method is presented for the compound-specific carbon and nitrogen isotope ratio analysis of a thermo-labile nitramine explosive hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) by gas chromatograph coupled to an isotope ratio mass spectrometer (GC-IRMS). Two main approaches were used to minimise thermal decomposition of the compound during gas chromatographic separation: programmed temperature vaporisation (PTV) as an injection technique and a high-temperature ramp rate during the GC run. δ15N and δ13C values of RDX measured by GC-IRMS and elemental analyser (EA)-IRMS were in good agreement within a standard deviation of 0.3‰ and 0.4‰ for nitrogen and carbon, respectively. Application of the method for the isotope analysis of RDX during alkaline hydrolysis at 50°C revealed isotope fractionation factors ε carbon = −7.8‰ and ε nitrogen = −5.3‰.
Original languageEnglish GB
Pages (from-to)1392-1400
JournalInternational Journal of Environmental Analytical Chemistry
Volume91
Issue number14
DOIs
StatePublished - 2011

Keywords

  • RDX
  • thermo-labile compound
  • CSIA
  • isotope fractionation

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