An investigation of the origin and mobility of phosphorus in freshwater sediments from Bort-Les-Orgues Reservoir, France.
In order to assess the origin and the potential mobility of phosphorus (P) in the sediment of the Bort-Les-Orgues Reservoir, France, two sequential extraction schemes, i.e., the SMT (modified Williams method) and the Golterman schemes, were compared. Finally, the potential mobility of P in this sediment was estimated from results of sequential extraction. The SMT method appeared to be more satisfactory than the Golterman method, which is in accordance with results from a study currently carried out in the framework of the European programme Standards, Measurements and Testing. Iron-bound P and organic P were the dominant forms of P in the sediment; these forms are likely to be released at the sediment/water interface in case of anoxia and could diffuse into the water column, thus increasing the risk of eutrophication in this sensitive reservoir. The P stock (330 +/- 66 t) is not negligible and should be taken into account in any restoration project of the reservoir. The SMT procedure seems promising and will provide, in the near future, a valuable tool for water managers in the field of lake restoration.
Ruban
V
V
Laboratoire Central des Ponts et Chaussées, B.P. 19, 44340 Bouguenais, France.
Brigault
S
S
Demare
D
D
Philippe
A M
AM
D004784:Environmental Monitoring; D005068:Eutrophication; D019015:Geologic Sediments / Q000737:chemistry*; D000860:Hypoxia; D010758:Phosphorus / Q000032:analysis* / Q000737:chemistry; D014873:Water Pollutants / Q000032:analysis*
D014873:Water Pollutants; D010758:Phosphorus