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    Effects of charging on the chromophores of dissolved organic matter from the Rio Negro basin

    Access Status
    Fulltext not available
    Authors
    Yan, M.
    Korshin, G.
    Claret, F.
    Croué, Jean-Philippe
    Fabbricino, M.
    Gallard, H.
    Schäfer, T.
    Benedetti, M.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Yan, M. and Korshin, G. and Claret, F. and Croué, J. and Fabbricino, M. and Gallard, H. and Schäfer, T. et al. 2014. Effects of charging on the chromophores of dissolved organic matter from the Rio Negro basin. Water Research. 59: pp. 154-164.
    Source Title
    Water Research
    DOI
    10.1016/j.watres.2014.03.044
    ISSN
    0043-1354
    School
    Curtin Water Quality Research Centre
    URI
    http://hdl.handle.net/20.500.11937/50094
    Collection
    • Curtin Research Publications
    Abstract

    This study demonstrates that the deprotonation of dissolved organic matter (DOM) originating from a small creek characteristic for DOM-rich waters located in the Rio Negro basin can be quantified based on measurements of pH effects on its absorbance spectra. The method was ascertained by the data of Near-Edge X-Ray Absorbance Spectroscopy (NEXAFS), potentiometric titration to quantify the structural and compositional differences between the colloidal and hydrophobic fractions that contribute 91% of black-water creek DOM. Changes in the absorbance spectra of the DOM fractions caused by deprotonation quantified via numeric deconvolution which indicated the presence of six well-resolved Gaussian bands in the differential spectra. The emergence of these bands was determined to be associated with the engagement of carboxylic and phenolic functionalities and changes of inter-chromophore interactions in DOM molecules. Interpretation of the data based on the NICA-Donnan approach showed that behavior of DOM chromophores was consistent with results of potentiometric titrations. Similar trends were observed for changes of the spectral slope of the DOM absorbance spectra in the range of wavelengths 325-375nm (DSlope325-375). The behavior of DSlope325-375 values was modeled based on the NICA-Donnan approach and correlated with potentiometrically-estimated charges attributed to the carboxylic and phenolic groups. The correlations between DSlope325-375 and charges of low- and high-affinity protonation-active groups in DOM were monotonic but not linear and had important differences between the colloidal and hydrophobic fractions.

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