Four fractions of dissolved organic matter (DOM) (hydrophobic acids, HPO-A; hydrophobic neutrals HPO-N; amphiphilic acids, AMP-A; and amphiphilic neutrals, AMP-N) were identified using electrospray ionization coupled to ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometer. The fractions were isolated from an off-stream Colorado River water reservoir in Arizona, USA. A great portion of heteroatom-containing (i.e., N, S, P) formulas were identified in the neutrals. Only 3.8% of the identified molecules were common between four fractions. The neutral fractions showed a high portion of high-intensity S-containing molecules which can be attributed to textile surfactants (i.e., linear alkylbenzene sulfonates, etc.) and their biodegradation and biotransformation derivatives indicating anthropogenic input on-site.

Original languageEnglish (US)
Title of host publicationFunctions of Natural Organic Matter in Changing Environment
PublisherSpringer Netherlands
Number of pages6
ISBN (Print)9789400756342, 940075633X, 9789400756335
StatePublished - Aug 1 2012


  • Amphiphilic
  • DOM
  • Electrospray ionization
  • ESI
  • Hydrophobic

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Environmental Science(all)
  • Engineering(all)


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