Fluorescence analysis allows to predict the oxidative capacity of humic quinones in dissolved organic matter: implicatio
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ORIGINAL PAPER
Fluorescence analysis allows to predict the oxidative capacity of humic quinones in dissolved organic matter: implication for pollutant degradation Davide Palma1 · Edith Parlanti2 · Mahaut Sourzac2 · Olivier Voldoire3 · Aude Beauger2 · Mohamad Sleiman1 · Claire Richard1 Received: 15 June 2020 / Accepted: 6 November 2020 © The Author(s) 2020
Abstract Dissolved organic matter (DOM) controls the degradation and sequestration of aquatic pollutants and, in turn, water quality. In particular, pollutant degradation is performed by oxidant species that are generated by exposure of DOM to solar light, yet, since DOM is a very complex mixture of poorly known substances, the relationships between potential oxidant precursors in DOM and their oxydative capacity is poorly known. Here, we hypothesized that production of oxidant species could be predicted using fluorescence analysis. We analysed water samples from an alluvial plain by fluorescence spectroscopy; the three-dimensional spectra were then decomposed into seven individual components using a multi-way algorithm. Components include a protein-like fluorophore, e.g. tryptophan-like and tyrosine-like, three humic fluorophores, 2-naphthoxyacetic acid, and a by-product. We compared component levels with the ability of water samples to generate reactive species under solar light. The results show a strong correlation between reactive species production and the intensity of two humic-like fluorophores assigned to reduced quinones. Monitoring these fluorophores should thus allow to predict the ability of DOM degradation of pollutants in surface waters. Keywords Dissolved organic matter · Cut-off meander · Quinonic-like components · Triplet excited states · Singlet oxygen · Correlation
Introduction Dissolved organic matter (DOM) encompasses ubiquitous natural components able to generate oxidant species under solar light exposure and thus to degrade aquatic pollutants in surface waters. Previous works have shown that the capacity of DOM to generate reactive species under solar irradiation Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10311-020-01137-z) contains supplementary material, which is available to authorized users. * Claire Richard [email protected] 1
Université Clermont Auvergne, CNRS, SIGMA-Clermont, ICCF, 63000 Clermont‑Ferrand, France
2
Université Bordeaux, CNRS, EPOC UMR 5805, 33405 Talence, France
3
Université Clermont Auvergne, CNRS, GEOLAB, 63000 Clermont‑Ferrand, France
could be predicted measuring its absorbance properties (Dalrymple et al 2010; Mckay et al. 2017; Peterson et al. 2012; Palma et al. 2020). Previous works also suggested that correlations may exist between DOM photoreactivity and fluorescence parameters (Coelho et al. 2011) or individual fluorescent components identified by deconvolution of the three-dimensional spectra by parallel factor analysis (PARAFAC, Timko et al. 2014; Bai et al. 2018; Batista et al. 2016). Here, our goal was to investigate the fluoro
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