Schöler Heinz F, Nkusi Gerard, Niedan Volker W, Müller German, Spitthoff Bianca
Institute of Environmental Geochemistry, University of Heidelberg, INF 236, D-69120 Heidelberg, Germany.
Chemosphere. 2005 Sep;60(11):1505-12. doi: 10.1016/j.chemosphere.2005.02.069. Epub 2005 Apr 22.
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 microg 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.
本文报道了在四次独立坠落事件中采集的四块碳质陨石（冷博克维尔德陨石、默里陨石、默奇森陨石和奥尔盖伊陨石）中，以总参数衡量的卤代有机化合物的出现情况以及氯代苯甲酸的证据。在进行可吸附有机卤素（AOX）和可萃取有机卤素（EOX）筛选以量化有机结合卤素后，通过气相色谱法分析了氯代有机化合物。在碳质陨石中观察到AOX浓度在124至209微克氯/克干重之间变化。对冷博克维尔德陨石进行的有机结合卤素分布的离子色谱分析表明，氯代和溴代有机化合物的可萃取率高达70%，而只能萃取出痕量的有机氟化物。在碳质陨石提取物中已鉴定出氯代苯甲酸。它们的存在和浓度引发了关于原始行星物质中卤代有机化合物，尤其是氯代有机化合物起源的问题。
