Screening of organic halogens and identification of chlorinated benzoic acids in carbonaceous meteorites

The occurrence of halogenated organic compounds measured as a sum parameter and the evidence of chlorinated benzoic acids in four carbonaceous meteorites (Cold Bokkeveld, Murray, Murchison and Orgueil) from four independent fall events is reported. After AOX (Adsorbable organic halogen) and EOX (Ext...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2005-09, Vol.60 (11), p.1505-1512
Main Authors: Schöler, Heinz F., Nkusi, Gerard, Niedan, Volker W., Müller, German, Spitthoff, Bianca
Format: Article
Language:English
Subjects:
AOX
Carbon - analysis
Carbonaceous chondrite
Chlorobenzoates - analysis
Chlorobenzoic acids
Chromatography, Gas
Cosmochemistry. Extraterrestrial geology
Earth sciences
Earth, ocean, space
EOX
Exact sciences and technology
Gas Chromatography-Mass Spectrometry
Halogens - analysis
Meteorites. Tectites. Impactites
Meteoroids
Spectrophotometry, Atomic
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Summary:The occurrence of halogenated organic compounds measured as a sum parameter and the evidence of chlorinated benzoic acids in four carbonaceous meteorites (Cold Bokkeveld, Murray, Murchison and Orgueil) from four independent fall events is reported. After AOX (Adsorbable organic halogen) and EOX (Extractable organic halogen) screening to quantify organically bound halogens, chlorinated organic compounds were analyzed by gas chromatography. AOX concentrations varying from 124 to 209 μg Cl/g d.w. were observed in carbonaceous meteorites. Ion chromatographic analysis of the distribution of organically bound halogens performed on the Cold Bokkeveld meteorite revealed that chlorinated and brominated organic compounds were extractable, up to 70%, whereas only trace amounts of organofluorines could be extracted. Chlorinated benzoic acids have been identified in carbonaceous meteorite extracts. Their presence and concentrations raise the question concerning the origin of halogenated, especially chlorinated, organic compounds in primitive planetary matter.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2005.02.069