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The influence of salinity on the molecular and optical properties of surface microlayers in a karstic estuary

Lechtenfeld, Oliver J.; Koch, Boris P.; Gašparović, Blaženka; Frka, Sanja; Witt, Matthias; Kattner, Gerhard (2013) The influence of salinity on the molecular and optical properties of surface microlayers in a karstic estuary. Marine Chemistry, 150 . pp. 25-38. ISSN 0304-4203

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Sea surface microlayers and the corresponding underlying waters of the pristine, karstic Krka Estuary (Croatia) were studied with respect to optical and molecular properties of dissolved organic matter (DOM). Solid-phase extracted DOM was separated by reversed phase chromatography and analyzed with ultra-high resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). The number and summed magnitudes of FT-ICR MS peaks, enriched in the microlayer, increased consistently with salinity along the estuary. The molecular hydrogen to carbon ratio (as a measure of polarity) of enriched compounds was higher for the low salinity samples than for the marine station, which we propose is a consequence of a salt-mediated separation mechanism. Absorption and fluorescence of all samples decreased along the estuary with the microlayer samples showing higher absorption than the underlying water. Chromatographic and FT-ICR MS data revealed a distinct shift towards a smaller molecular size in the microlayer. The redistribution of dissolved organic carbon within chromatographic fractions and the decrease in molecular size was interpreted to result from photo-degradation and/or microbial reprocessing. Collision induced dissociation of selected FT ICR MS mass peaks revealed the presence of sulfur containing anthropogenic surfactants enriched in the microlayer.

Item Type: Article
Uncontrolled Keywords: sea-surface microlayer; ultra-high resolution mass spectrometry; FT-ICR MS; dissolved organic matter; molecular composition; optical properties
Subjects: NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions: Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Priroda organske tvari, interakcije s mikrokonstituentima i površinama u okolišu-Irena Ciglenečki-Jušić098-0982934-2717MZOS
Depositing User: Blaženka Gašparović
Date Deposited: 22 May 2018 08:39
DOI: 10.1016/j.marchem.2013.01.006

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