title: Fluorescence spectroscopy to study dissolved organic matter interactions with agrochemicals applied in Swiss vineyards.
abstract: UV/Vis fluorescence spectroscopy was used to study the possible interactions of dissolved organic matter (DOM) with the herbicide glyphosate and copper-based fungicide used in vineyards. The study focused on the role of DOM in the transport of these micropollutants from parcels to surface waters (river, lake). Soil solution and river water samples were collected in the Lavaux vineyard area, western Switzerland. Their fluorescence excitation emission matrices (EEM) were decomposed using parallel factor (PARAFAC) analysis, and compared to their content in glyphosate and copper. PARAFAC analysis of EEM of both types of samples showed the contribution of protein-like and humic-like fluorophores. In soil water samples, complexes between fulvic-like and humic-like fluorophores of DOM, copper, and glyphosate were likely formed. In surface water, DOM-copper and glyphosate-copper interactions were observed, but not between glyphosate and DOM.
authors.affiliation: Institute of Earth Sciences, Faculty of Geosciences and Environment, University of Lausanne (UNIL), Géopolis, 1015, Lausanne, Switzerland, silwan.daouk@hcuge.ch.
authors.forename: Silwan
authors.initials: S
authors.lastname: Daouk
authors.forename: Carla
authors.initials: C
authors.lastname: Frege
authors.forename: Nicolas
authors.initials: N
authors.lastname: Blanc
authors.forename: Stéphane
authors.initials: S
authors.lastname: Mounier
authors.forename: Roland
authors.initials: R
authors.lastname: Redon
authors.forename: Patricia
authors.initials: P
authors.lastname: Merdy
authors.forename: Yves
authors.initials: Y
authors.lastname: Lucas
authors.forename: Hans-Rudolf
authors.initials: HR
authors.lastname: Pfeifer
mesh_terms: D003300:Copper / Q000737:chemistry*; D005163:Factor Analysis, Statistical; D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry; D045483:Rivers / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013557:Switzerland; D027843:Vitis / Q000187:drug effects* / Q000502:physiology; D014874:Water Pollutants, Chemical / Q000737:chemistry; D000097797:Glyphosate
chemical_list: D003300:Copper; D005998:Glycine; D012987:Soil; D014874:Water Pollutants, Chemical; D000097797:Glyphosate