Application Of High Resolution Mass Spectrometry In The Study Of Organic Matters In Huolinguole Brown Coal

Huolinguole lignite was sequentially extracted with petroleum ether, carbon disulfide, ethyl acetate, methanol, acetone and isometric carbon disulfide/acetone mixed solvent under ultrasonic irradiation to obtain six extracts in this study. All extracts were analyzed by the Fourier cyclotron resonance mass spectrometer(FT-ICR-MS) equipped with different ion sources to explore their structure features. The results show that: the petroleum ether extract contains a large number of compounds that can only be detected under APPI mode with a molecular mass less than 400 Da. Besides, some compounds with a larger molecular mass and low saturation degree were also detected. Carbon disulfide extract, ethyl acetate extract and acetone extract were mainly detected under APPI ionsource mode with a wide range of molecular mass and degree of unsaturation, indicating that the three extracts mostly consist of less polar compounds. In addition, the carbon number of compounds containing oxygen atom detected under ESI ionsource in negative mode are bigger than 15. Methanol extract was mainly detected under ESI ionsource in negative mode with a wide range of molecular mass ranging from 200 to 600 Da. Isometric carbon disulfide/acetone mixed solvent extracts can be detected under all ion sources, which may result from the synergistic effect of acetone and carbon disulfide solvent, thus compounds with different polarity and nature can be dissolved easily. H/C-O/C statistics contains a variety of ray emitted from(0, 2), which result from the removal or addition of-OH, H3O+, H2 O and a series of particles containing H atom and O atom, Different slope denotes different different H/O ratio.