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<datestamp>2017-12-21</datestamp>
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<title lang=en>Revealing organic carbon-nitrate linear relationship from UV spectra of freshwaters in agricultural environment</title>
<creator>Thomas, O.</creator>
<creator>Jung, A. V.</creator>
<creator>Causse, J.</creator>
<creator>Louyer, M. V.</creator>
<creator>Piel, S.</creator>
<creator>Baurès, E.</creator>
<creator>Thomas, M. F.</creator>
<contributor>Institut de recherche, santé, environnement et travail [Rennes] (Irset) ; Université d'Angers (UA) - Université des Antilles et de la Guyane (UAG) - Université de Rennes 1 (UR1) - École des Hautes Études en Santé Publique [EHESP] (EHESP) - Institut National de la Santé et de la Recherche Médicale (INSERM) - Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique )</contributor>
<contributor>École des Hautes Études en Santé Publique [EHESP] (EHESP)</contributor>
<description>International audience</description>
<source>ISSN: 0045-6535</source>
<source>Chemosphere</source>
<publisher>Elsevier</publisher>
<identifier>hal-01063932</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01063932</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01063932</source>
<source>Chemosphere, Elsevier, 2014, 107, pp.115--120. 〈10.1016/j.chemosphere.2014.03.034〉</source>
<identifier>DOI : 10.1016/j.chemosphere.2014.03.034</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemosphere.2014.03.034</relation>
<identifier>PUBMED : 24875878</identifier>
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<language>en</language>
<subject>[SDV] Life Sciences [q-bio]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>A strong non linear relationship between nitrate and organic matter (assessed by dissolved organic carbon, DOC) has been recently demonstrated by Taylor and Townsend (2010), namely for freshwaters. In this context, our study explores this relation from the behavior of sets of normalized UV spectra (same area under each spectrum) of different water samples showing a hidden isosbestic point (HIP) around 225 nm. This HIP is linked to the existence of a simple relation between nitrate and DOC, the proportions of which vary according to the sampling location and environmental factors. In a second step, a simple linear model is proposed for nitrate-DOC relationship (α⋅NO3+β⋅DOC=1) and a validation is proposed for more than 150 samples of different Brittany rivers and lakes. For samples of the largest watershed, a complementary exploitation from data acquired during the different campaigns confirmed the seasonal evolution between spring (high nitrate/low DOC) and autumn (high DOC/low nitrate). Further investigation on other freshwater samples is needed in order to improve the limits of this linear model.</description>
<date>2014</date>
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