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Open Access Green as soon as Postprint is submitted to ZB.
How representative are dissolved organic matter (DOM) extracts? A comprehensive study of sorbent selectivity for DOM isolation.
Water Res. 116, 316-323 (2017)
Solid phase extraction (SPE) has become a widespread method for isolating dissolved organic matter (DOM) of diverse origin such as fresh and marine waters. This study investigated the DOM extraction selectivity of 24 commercially available SPE sorbents under identical conditions (pH = 2, methanol elution) on the example of Suwannee River (SR) water and North Sea (NS) water by using DOC analysis and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Proton nuclear magnetic resonance ((1)H NMR) spectroscopy was employed to assess leaching behavior, and HLB sorbent was found to leach substantially, among others. Variable DOC recoveries observed for SR DOM and NS DOM were primarily caused by the respective molecular composition, with subordinated and heterogeneous contributions of relative salinity. Scatter of average H/C and O/C elemental ratios and gross alignment in mass-edited H/C ratios according to five established coarse SPE characteristics was near identical for SR DOM and NS DOM. FTMS-based principal component analysis (PCA) provided essentially analogous alignment of SR DOM and NS DOM molecular compositions according to the five established groups of SPE classification, and corroborated the sorption-mechanism-based selectivity of DOM extraction in both cases. Evaluation of structural blanks and leaching of SPE cartridges requires NMR spectroscopy because FT-ICR mass spectrometry alone will not reveal inconspicuous displacements of continual bulk signatures caused by leaching of SPE resin constituents.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Dom ; Ft-icr Ms ; Leaching ; Nmr ; Spe ; Sorbent Selectivity; Solid-phase Extraction; Resonance Mass-spectrometry; Field Nmr-spectroscopy; Molecular Characterization; Ocean; Carbon; River; Identification; Insights; Spectra
ISSN (print) / ISBN
0043-1354
e-ISSN
1879-2448
Journal
Water Research
Quellenangaben
Volume: 116,
Pages: 316-323
Publisher
Elsevier
Publishing Place
Amsterdam [u.a.] ; Jena [u.a.]
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Research Unit Analytical BioGeoChemistry (BGC)