| Titre : | Seasonal cycle and mass balance of cadmium in an estuary with an agricultural catchment: The Morlaix River estuary (Brittany, France) |
| Auteurs : | P. Monbet, Auteur |
| Type de document : | Article |
| Dans : | Estuaries (27(3) JUN 2004) |
| Article en page(s) : | 448-459 |
| Résumé : | Cadmium (Cd) variations were investigated over an annual cycle (12 surveys between February 1998-January 1999) in the Morlaix estuary (Brittany, France) in both the water column and the benthic compartment in relation to hydrological conditions. The drainage basin of the Morlaix River estuary is predominantly agricultural in character. Dissolved Cd concentrations in the water column varied from 0.04 to 0.48 nM. Particulate Cd concentrations ranged from 1 to 64 nmol g(-1). These concentrations reach levels commonly observed in estuaries affected by heavy industrial activities. Extensive agricultural activities in the drainage basin may be responsible for Cd levels above pristine conditions. Metal concentrations varied significantly over the seasonal cycle and the dissolved fraction exhibited high values in summer months. Particulate concentrations were always lowest during this season. In the benthic compartment, Cd concentrations in surface sediment varied from 0.4 to 5.0 nmol g(-1) and from 0.2 to 5.0 nM in porewaters. Concentrations in sediment were slightly affected by Cd contamination and temporal changes were important over the seasonal cycle. The variations seem to be controlled by the succession of sedimentation and erosion processes, which are tightly linked to seasonal changes in river discharge. A box model was constructed based on known Cd sources and sinks in the estuary. Cd is chiefly brought into the estuary by the Morlaix River and accumulates within the estuary. The accumulation within the estuary represents from 6.3 to 7.2 kg yr(-1). |
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