Fang Zhi - Molecular Characterization and Transformation of Dissolved Organic Matter in Refinery Wastewater from Water Treatment Processes: Characterization by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

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        A set of wastewaters sampled in a stream-by-stream flow of the   process in a refinery wastewater treatment plant were   characterized to investigate the molecular composition and   transformation of dissolved organic matter (DOM). The samples   were separated into organic and aqueous phase DOMs by solvent   extraction and solid phase extraction (SPE). Volatile and   semivolatile compounds in the organic phase were characterized by   gas chromatography–mass spectrometry (GC-MS); DOMs in the organic   and aqueous phases were characterized by negative ion   electrospray (ESI) coupled with Fourier transform ion cyclotron   resonance mass spectrometry (FT-ICR MS). The aqueous phase DOMs   exhibited a more complex molecular composition than other complex   mixtures investigated by far, in which there were totally 76   compound class species identified in a single mass spectrum.   Refinery wastewater DOMs have lower values of double bond   equivalent (DBE) and O/C ratio than those of natural organic   matter (NOM) in fresh and marine waters. The organic phase DOM   occupied the major TOC value, but was liable to be degraded in   the biological process. Some humic-like substances presented in   the aqueous DOM were found resistant to the treatment processes   by the ESI FT-ICR MS based semiquantitative results.


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