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Paramètres influençant la distribution des éléments traces métalliques dans les affluents du fleuve Garonne (France)

Abstract : The left-bank tributaries of the Garonne River, located in the South-West of France, cross catchments, is affected by significant agricultural activities. To evaluate the quality of the dissolved fraction, seventy-five(75) samples of river waters were collected. Several trace elements were analyzed in this aqueous phase. The average metal trace element concentrations, in this region, are in the decreasing order: Zn (4.46 μg.l-1), As (1.03 μg.l-1), Cu (0.79 μg.l-1) Ni (0.62 μg.l-1), Cr (0.30 μg.l-1), Co (0.23 μg.l-1), Pb (0.04 μg.l-1), and Cd (0.01 μg.l-1). These values are, for the majority, lower than those of waters of rivers in non-anthropized areas. The distribution of these elements is controlled by chloride and organic matter, particularly in the areas where the anthropogenic inputs of these compounds are significant. In less anthropized areas, the availability of these trace elements in the water column decreases when the pH and the alkalinity increase according to natural geochemical processes. These observations show the predominant action of anthropogenic activities on the mobility and the biological availability of metallic pollutants in the tributaries of the Garonne River.
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Submitted on : Wednesday, November 8, 2017 - 10:34:47 AM
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yao Mathieu N'Guessan, Valérie Ama Wognin, Kouamé Georges Kouadio, Anne Probst, Jean-Luc Probst. Paramètres influençant la distribution des éléments traces métalliques dans les affluents du fleuve Garonne (France). International Journal of Biological and Chemical Sciences, International Formulae Group (IFG), 2017, 11 (3), pp.1361-1372. ⟨10.4314/ijbcs.v11i3.35⟩. ⟨hal-01630758⟩

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