title: Assessment of field fluorometers.
abstract: Two field fluorometers, devoted either to natural organic matter (NOM) or to tryptophan-like fluorescing substances, were tested for the characterization of a large set of water samples (n = 263) impacted to various degrees by untreated or poorly treated urban sewage. Both fluorometers yielded consistent results when testing discrete samples. A nonlinear correlation (coefficient of determination = 0.98) was found between the tryptophan concentration given by the tryptophan field fluorometer and the fluorescence intensity given by a bench-top fluorometer (excitation = 285 nm, emission = 335 nm), corresponding to tryptophan-like fluorescing substances. A linear correlation with a mediocre coefficient of determination (0.63) was found between the NOM concentration given by the NOM field fluorometer and the fluorescence intensity given by the bench-top fluorometer (excitation = 355 nm, emission = 405 nm). This could be related to the diversity of NOM present, as illustrated by the different shapes of synchronous fluorescence spectra collected for the same samples.
authors.affiliation: Laboratoire Réactions et Génie des Procédés - CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy cedex, France E-mail: marie-noelle.pons@univ-lorraine.fr.
authors.forename: A
authors.initials: A
authors.lastname: Gutierrez
authors.affiliation: Laboratoire Réactions et Génie des Procédés - CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy cedex, France E-mail: marie-noelle.pons@univ-lorraine.fr.
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Laboratoire Réactions et Génie des Procédés - CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy cedex, France E-mail: marie-noelle.pons@univ-lorraine.fr.
authors.forename: A
authors.initials: A
authors.lastname: Assaad
authors.affiliation: GEMCEA, 149 rue Gabriel Péri, 54500 Vandœuvre-lès-Nancy cedex, France.
authors.forename: X
authors.initials: X
authors.lastname: France
authors.affiliation: Laboratoire Réactions et Génie des Procédés - CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy cedex, France E-mail: marie-noelle.pons@univ-lorraine.fr.
authors.forename: N
authors.initials: N
authors.lastname: Adouani
authors.affiliation: Laboratoire Réactions et Génie des Procédés - CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy cedex, France E-mail: marie-noelle.pons@univ-lorraine.fr.
authors.forename: M N
authors.initials: MN
authors.lastname: Pons
mesh_terms: D004784:Environmental Monitoring; D005453:Fluorescence; D005470:Fluorometry / Q000295:instrumentation*; D006812:Humic Substances / Q000032:analysis*; D011803:Quinine / Q000032:analysis*; D012722:Sewage; D013050:Spectrometry, Fluorescence; D014364:Tryptophan / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D006812:Humic Substances; D012722:Sewage; D014873:Water Pollutants; D014364:Tryptophan; D011803:Quinine