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| - Sorption of Aldrich Humic Acid ontoHematite: Insights intoFractionation Phenomena byElectrospray Ionization withQuadrupole Time-of-Flight MassSpectrometry
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| - Sorption induced fractionation of purified Aldrich humicacid (PAHA) on hematite is studied through the modificationof electrospray ionization (ESI) quadrupole time-of-flight(QToF) mass spectra of supernatants from retentionexperiments. The ESI mass spectra show an increase ofthe “mean molecular masses” of the molecules thatconstitutes humic aggregates. The low molecular weightfraction (LMWF; m/z ≤ 600 Da) is preferentially sorbedcompared to two other fractions. The resolution providedby ESI-QToF mass spectrometer in the low-mass rangeprovided evidence of further fractionation induced by sorptionwithin the LMWF. Among the two latter fractions, thehigh molecular weight fraction (HMWF; m/z ≈ 1700 Da)seems to be more prone to sorption compared to theintermediate molecular weight fraction (IMWF; m/z ≈ 900Da). The IMWF seems to be more hydrophilic as itshould be richer in O, N, and alkyl C from the proportionof even mass, and poorer in aromatic structures from massdefect analysis in ESI mass spectra.
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