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Influence of leaching solution and catchment location on the fluorescence of water-soluble organic matter.
Gabor, Rachel S; Burns, Margaret A; Lee, Robert H; Elg, Jordan B; Kemper, Cayla J; Barnard, Holly R; McKnight, Diane M.
Afiliación
  • Gabor RS; †Environmental Studies Program, University of Colorado Boulder, Boulder, Colorado 80309, United States.
  • Burns MA; ‡Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States.
  • Lee RH; #INSTAAR, University of Colorado Boulder, Boulder, Colorado 80309, United States.
  • Elg JB; §Department of Geography, University of Colorado Boulder, Boulder, Colorado 80309, United States.
  • Kemper CJ; #INSTAAR, University of Colorado Boulder, Boulder, Colorado 80309, United States.
  • Barnard HR; ∥Department of Geology, University of Colorado Boulder, Boulder, Colorado 80309, United States.
  • McKnight DM; #INSTAAR, University of Colorado Boulder, Boulder, Colorado 80309, United States.
Environ Sci Technol ; 49(7): 4425-32, 2015 Apr 07.
Article en En | MEDLINE | ID: mdl-25671820
Organic matter (OM) plays a significant role in biogeochemical processes in soil and water systems. Water-soluble organic matter (WSOM) leached from soil samples is often analyzed as representative of potentially mobile OM. However, there are many WSOM extraction methods in the literature with no clear guidelines for method selection. In this study, four common leaching solutions (0.5 M K2SO4, 0.01 M CaCl2, 2 M KCl, and H2O) were used to extract WSOM from various locations within a forested catchment. Fluorescence spectroscopy was used to analyze the impact of extraction method on WSOM chemistry. While all four methods consistently identified chemical differences between WSOM from a north-facing slope, south-facing slope, and riparian zone, there were clear differences in fluorescence signals between the leaching methods. All three salt solutions contained WSOM with a higher fluorescence index and humification index than WSOM leached with H2O, suggesting the presence of salts releases different fractions of the soil organic matter. A parallel factor analysis (PARAFAC) model developed from the leachates identified a distinctive soil humic fluorophore observed in all samples and fluorescent artifacts present in H2O-leached samples.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Compuestos Orgánicos / Cloruro de Potasio / Espectrometría de Fluorescencia / Sulfatos / Cloruro de Calcio Tipo de estudio: Prognostic_studies Idioma: En Revista: Environ Sci Technol Año: 2015 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Compuestos Orgánicos / Cloruro de Potasio / Espectrometría de Fluorescencia / Sulfatos / Cloruro de Calcio Tipo de estudio: Prognostic_studies Idioma: En Revista: Environ Sci Technol Año: 2015 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos