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Evolution of the chemical composition of the Garonne River water during the period 1971-1984

Etchanchu, D. and Probst, Jean-Luc Evolution of the chemical composition of the Garonne River water during the period 1971-1984. (1988) Hydrological sciences journal , vol. 33 (n°3). pp. 243-256. ISSN 0262-6667

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Official URL: http://dx.doi.org/10.1080/02626668809491246

Abstract

The evolution of the chemical composition of the Garonne River water was studied for the period 1971-1984. Long-term trends have been detected and quantified for all the major elements using concentration-time relationships. An increasing concentration is observed for most of the elements while the pH exhibits a small decrease. The large increases of NOj, SO2/", CI" and K+ in the river water are related to a marked increase in fertilizer applications. Ca2+, Mg2+ and HCO3 increases are not so evident. The coefficient of calcite saturation is too low to explain this change but rather it can be attributed to an increase in carbonate dissolution resulting from the nitrification of N fertilizers in the basin. A decrease in pH, more particularly during low flows, is attributed to oxidation of organic matter which is reflected by an increase in COD.

Item Type:Article
Additional Information:The definitive version is available at http://www.informaworld.com/smpp/content~db=all~content=a918061919~frm=titlelink
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Université Louis Pasteur-Strasbourg I - ULP (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By: Florence Amor
Deposited On:09 Feb 2011 11:30

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