NDLI: Reactivity, interactions and transport of trace elements, organic carbon and particulate material in a mountain range river system (Adour River, France)

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Reactivity, interactions and transport of trace elements, organic carbon and particulate material in a mountain range river system (Adour River, France)

Content Provider	Royal Society of Chemistry (RSC)
Author	Point, David Bareille, Gilles Amouroux, David Etcheber, Henri Donard, Olivier F. X.
Copyright Year	2007
Abstract	The background levels, variability, partitioning and transport of eleven trace elements—Ag, Al, As, Cd, Co, Cr, Cu, Mn, Pb, Zn and U—were investigated in a mountain range river system (Adour River, France). This particular river system displayed a turbulent hydrodynamic regime, characterized by flash-transient discharge conditions leading to fast shifts in suspended particulate matter (SPM) concentrations as high as two orders of magnitude (12 to 600 mg l−1). The distribution of SPM was accurately predicted with a “hysteresis” transport model, indicating that about 75% of the annual solids load was exported within 20 to 40 days. Dissolved and particulate concentrations of most trace elements were low compared to their concentrations in other reference river systems expect for Pb and Cr, associated with historical anthropogenic activities. Although dissolved and particulate metal concentrations were steady for most elements during low and average discharge conditions, significant changes were observed with increasing river discharge. The changes in trace element concentrations in the two compartments was found to induce a partitioning anomaly referred to as the particulate concentration effect. This anomaly was significant for Cr, Mn, Pb, Zn, Cu and organic carbon (p < 0.03). The processes driving this anomaly were possibly linked to the modification and/or increase of colloidal organic and inorganic vectors, suggested by the significant increase of DOC (p < 0.001) and dissolved Al concentrations (p < 0.05) during flood conditions. A complementary process linked to the influence of coarse particles of low complexation capacity and transported mainly during high discharge may also effect trace element concentrations. Annual metal fluxes transported by this river system were estimated using the hysteresis SPM model with consideration of these fate processes. Metals in the Adour River system are primarily exported into the Bay of Biscay (Atlantic Ocean).
Starting Page	157
Ending Page	167
Page Count	11
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	9
Issue Number	2
Journal	Journal of Environmental Monitoring
DOI	10.1039/b616312b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Cu SPM DOC Al Adour River France Bay of Biscay Atlantic Ocean Lead Mountain Adour Hysteresis Trace element Carbon
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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