大气压光电离质谱分析霍林郭勒褐煤中的有机质

发布时间：2018-08-06 20:35

【摘要】：依次用CS2、乙酸乙酯、甲醇和丙酮萃取内蒙古霍林郭勒褐煤,得到各级萃取物。采用配有大气压光电离源(APPI)的飞行时间质谱仪对所得萃取物进行分析。选择甲苯和1,4-二氟苯作为APPI电离条件下的助离子化剂。结果表明,1,4-二氟苯和甲苯都表现出较好的助离子化效果,得到更多煤的可溶组分的分子信息。其中甲苯对离子信号强度的提升作用更为明显。在煤的各级萃取物中发现了较多的二聚体现象,可能是分子间缔合形成的分子簇,这间接证明了煤体系内存在分子间缔合交联现象。并且发现缔合分子均含有杂原子。在3种离子化条件下,煤萃取物的分子量分布区间差异不大:60%的萃取物分子量在200~500 Da之间,约10%的萃取物分子量500 Da。大气压光电离质谱离子化法结合1,4-二氟苯和甲苯这两种助离子化剂均能很好地分析煤中分子量较大(500 Da)的弱极性或非极性化合物。
[Abstract]:In turn, CS _ 2, ethyl acetate, methanol and acetone were used to extract Huolingol lignite from Inner Mongolia. Time of flight mass spectrometer with atmospheric pressure photoionization source (APPI) was used to analyze the extracted products. Toluene and 1o 4-difluorobenzene were selected as auxiliary ionization agents under APPI ionization condition. The results show that both difluorobenzene and toluene exhibit better ionization effect and obtain more molecular information of soluble components of coal. The effect of toluene on the enhancement of ion signal intensity is more obvious. A large number of dimer phenomena were found in all levels of coal extracts, which may be molecular clusters formed by intermolecular association, which indirectly proves the existence of intermolecular association and crosslinking in coal systems. It is also found that all the associated molecules contain heteroatoms. Under the conditions of three kinds of ionization, the molecular weight distribution of the coal extract was not different in the range of: 60% and about 10%, the molecular weight of the extract was between 200,500 Da and 500 Da, respectively. Atmospheric pressure photoionization mass spectrometry (APCMS) combined with 1 ~ (4) -difluorobenzene and toluene can be used to analyze weakly polar or nonpolar compounds with high molecular weight (500Da) in coal.
【作者单位】：中国矿业大学煤炭加工与高效洁净利用教育部重点实验室;安徽工业大学化学与化工学院;
【基金】：长江学者和创新团队发展计划(No.IRT13054) 国家自然科学基金项目(No.21676293) 东华理工大学江西省质谱科学与仪器重点实验室开放基金(No.JXMS201504) 中国矿业大学煤炭加工与高效洁净利用教育部重点实验室开放基金(No.CPEUKF1404) 安徽高校省级自然科学研究重点项目(No.KJ2014A031)资助~~
【分类号】：O657.63;TQ533

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