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Characterization of the colloidal organic matter from the Amazonian basin by asymmetrical flow field-flow fractionation and size exclusion chromatography

Enrica Alasonati 1 Vera Slaveykova 1 Hervé Gallard 2 Jean-Philippe Croué 2 Marc Benedetti 3
1 Ecole Polytech Fed Lausanne, Inst Environm Engn, Environm Biophys Chem Grp EBC, CH-1015 Lausanne, Switzerland
2 LCME - Laboratoire de Chimie et Microbiologie de l'Eau
3 IPGP - Institut de Physique du Globe de Paris
Abstract : Colloidal organic matter (COM) collected in small and large watercourse tributaries of the Negro River (Brazil) were fractionated and characterized by an asymmetrical flow field-flow fractionation (AFIFFF) coupled to UV and seven angle laser light scattering (LS) detectors, and by size exclusion chromatography (SEC) coupled with a UV detection. Number and weight average molar masses, weight average gyration radiuses R-Gw and polydispersity indexes were obtained for each sample in two separate runs under conditions optimized for lower and larger size fractions. The results demonstrate the existence of a decrease of size of the colloidal matter when passing from first order streams to higher order rivers. No significant changes were found in size distributions of samples collected during the low and high flow stages at the same site. The influence of selected pre-treatments such as filtration and reverse osmosis pre-concentration on the size and molar mass distributions was also studied
Keywords : Amazon Organic matter Flow field-flow fractionation Size exclusion chromatography Size distribution Colloids
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Submitted on : Wednesday, July 1, 2020 - 10:11:30 AM
Last modification on : Thursday, December 16, 2021 - 3:54:52 AM

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INSU | UNIV-POITIERS | CNRS | UNIV-PARIS | AFRIQ | IPGP | INC-CNRS

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Enrica Alasonati, Vera Slaveykova, Hervé Gallard, Jean-Philippe Croué, Marc Benedetti. Characterization of the colloidal organic matter from the Amazonian basin by asymmetrical flow field-flow fractionation and size exclusion chromatography. Water Research, IWA Publishing, 2009, 44 (1), pp.223-231. ⟨10.1016/j.watres.2009.09.010⟩. ⟨insu-02885910⟩

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