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- Title
Total Phosphorous Distribution and Bioavailability in the Bed Sediments of an Atlantic Basin (Galicia, NW Spain): Spatial Distribution and Vertical Profiles.
- Authors
Devesa-Rey, R.; Iglesias, M.; Díaz-Fierros, F.; Barral, M.
- Abstract
The Anllóns basin (NW Spain) has been included in the Natura 2000 Network and declared as Site of Community Importance. The main contamination problems of the basin come from a former gold mine and from agricultural activities, which influence the quality of the sediment–water system. Phosphorus (P) enrichment in the bed sediments was evaluated by analyzing P in the pore waters, in the surface bed sediments, and in the vertical sediment profiles, including both total and bioavailable forms. Two granulometric fractions (<2 mm and <63 μm) were evaluated. Pore waters, bed sediments, and vertical profiles showed high percentages of the bioavailable P fraction with respect to the total P content, which evidences the potential risk of pollution which suppose the bed sediments of the Anllóns River. The vertical profiles showed P enrichment in the superficial layers, which could be the consequence of the increased use of fertilizers in the last decades. With regards to the granulometric distributions, the <63 μm showed, in general, higher P concentrations than the <2 mm fraction. However, at the sampling points most heavily contaminated, the concentration of both fractions becomes similar, thus indicating that, at these sites, the coatings formed over sands can retain important P concentrations in the bed sediments.
- Subjects
GALICIA (Spain : Region); SPAIN; CONTAMINATED sediments; TOXICOLOGY of phosphorus; PORE fluids; BIOAVAILABILITY; GOLD mining &; the environment; AGRICULTURAL ecology; RESEARCH methodology; DRILL core analysis
- Publication
Water, Air & Soil Pollution, 2009, Vol 200, Issue 1-4, p341
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-008-9917-3