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Origin and fate of copper in a small Mediterranean vineyard catchment: New insights from combined chemical extraction and δ65Cu isotopic composition

El Azzi, Désirée and Viers, Jérôme and Guiresse, Agnès Maritchù and Probst, Anne and Aubert, Dominique and Caparros, Jocelyne and Charles, François and Guizien, Katell and Probst, Jean-Luc Origin and fate of copper in a small Mediterranean vineyard catchment: New insights from combined chemical extraction and δ65Cu isotopic composition. (2013) Science of the Total Environment, 463-464. 91-101. ISSN 0048-9697

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Official URL: http://dx.doi.org/10.1016/j.scitotenv.2013.05.058

Abstract

For centuries, many Mediterranean catchments were covered with vineyards in which copper was widely applied to protect grapevines against fungus. In the Mediterranean-type flow regime, brief and intense flood events increase the stream water discharge by up to 10 times and cause soil leaching and storm runoff. Because vineyards are primarily cultivated on steep slopes, high Cu fluxes are discharged by surface water runoff into the rivers. The purpose of this work was to investigate the riverine behavior and transport of anthropogenic Cu by coupling a sequential chemical extraction (SCE) procedure, used to determine Cu partitioning between residual and non-residual fractions, with δ65Cu isotopic measurements in each fraction. In the Baillaury catchment, France, we sampled soils (cultivated and abandoned), river bed sediments (BS), suspended particulate matter (SPM), and river water during the flash flood event of February 2009. Copper partitioning using SCE show that most of Cu in abandoned vineyard soil was in the residual phase (>60%) whereas in cultivated soil, BS and SPM, Cu was mostly (>25%) in non-residual fractions, mainly adsorbed onto iron oxide fractions. A small fraction of Cu was associated with organic matter (5 to 10%). Calculated enrichment factors (EF) are higher than 2 and the anthropogenic contribution was estimated between 50 to 85%. Values for δ65Cu in bulk samples were similar to bedrock therefore; δ65Cu on SCE fractions of superficial soils and SPM allowed for discrimination between Cu origin and distribution. Copper in residual fractions was of natural mineral origin (δ65Cu close to local bedrock, +0.07‰). Copper in water soluble fraction of SPM (δ65Cu = +0.26‰) was similar to dissolved river Cu (δ65Cu = +0.31‰). Copper from fungicide treatment (δ65Cu = −0.35‰) was bound to organic matter (δ65Cu = −0.20‰) without or with slight isotopic fractioning. A preferential adsorption of 65Cu onto iron oxides (δ65Cu = +0.5‰) is shown.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S0048969713006013
HAL Id:hal-00843304
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Perpignan Via Domitia - UPVD (FRANCE)
Laboratory name:
Funders:
INSU-CNRS
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Deposited By: Jean-luc PROBST
Deposited On:09 Jul 2013 08:49

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