The unextractable organic fraction of the pueblito de allende meteorite: evidence for its indigenous nature.
The unextractable organic fraction of the pueblito de allende meteorite: evidence for its indigenous nature.
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pueblito de allende 陨石中不可提取的有机部分：其本土性质的证据。
DOI：
10.1073/pnas.64.3.1027
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发表时间：
1969
影响因子：
11.1
通讯作者：
J. Oró
中科院分区：
文献类型：
--
作者：
P. Simmonds;A. J. Bauman;E. M. Bollin;E. Gelpí;J. Oró
普埃夫利托阿连德陨石只含有0.1-0.5 ppm的溶剂可提取碳，其中大部分或全部是由于陆地污染。总碳含量的测定值为0.23%至0.35%，因此，假定的固有不溶性碳与污染物碳的比例为2300：1。陨石样品用含苯：甲醇（4：1 w/w）的氘代溶剂提取，以去除污染物，然后进行热解-气相色谱-质谱分析，以研究剩余碳的性质。热解产物（约20 ppm）主要由芳烃和取代芳烃组成。通过氧化热分析证实了热解结果，其表明存在的大部分碳是大分子结构而不是石墨。这表明，不溶性nongraphitic稠合芳香族聚合物是本土的陨石。这种物质的起源和精确的化学结构尚未确定，但它与煤状结构有表面相似之处。
The Pueblito de Allende meteorite contains only 0.1-0.5 ppm of solvent-extractable carbon, most or all of which is due to terrestrial contamination. Determinations of the total carbon content gives values from 0.23 to 0.35 per cent. The presumed indigenous insoluble carbon is thus present in a ratio of 2300:1 relative to contaminant carbon. A sample of the meteorite was extracted with a deuterated solvent containing benzene:methanol (4:1 w/w) to remove contaminants and then was subjected to pyrolysis-gas chromatography-mass spectrometry to investigate the nature of the remaining carbon. The pyrolysis products (about 20 ppm) consisted chiefly of aromatic and substituted aromatic hydrocarbons. The pyrolysis results were confirmed by oxidative thermal analysis which showed that the bulk of the carbon present was a macromolecular structure and not graphite. This suggests that an insoluble nongraphitic condensed aromatic polymer is indigenous to the meteorite. The origin and precise chemical structure of this material has not been determined, but it bears a superficial resemblance to coal-like structures.