Molecular Characterization of Dissolved Organic Matter in Underground Water by ESI FT-ICR MS
ZENG Chun-pin;WU Fa-wei;DONG Jun;YUAN Peng-hui;Shandong Geological Engineering Investigation Institute;
A Fourier transform ion cyclotron resonance mass spectrometry combined with electrospray ionization source( ESI FT-ICR MS) method was applied to detect the groundwater. Benefitted from the high precision molecular weight,three categories of O_x and N_1O_x and N_2O_x were identified,which are composed of a total of 27 heteroatomic compounds classes. O_x are dominant in these classes that nitrogen compounds combining with several O atoms are widely existed. Depending on the distribution pattern of equivalent double bond( DBE) and carbon number of heteroatomic compounds, large amounts of carboxyl were found to be present in O_x and nitrogen compounds were speculated to be derived from O_x . This work has broadened the understanding of soluble organic matter in groundwater and laid a foundation for the further research on its molecular structure.