Document Detail

Diffuse and point sources of silica in the Seine River watershed.
MedLine Citation:
PMID:  17144288     Owner:  NLM     Status:  MEDLINE    
Dissolved silica (DSi) is believed to enter aquatic ecosystems primarily through diffuse sources by weathering. Point sources have generally been considered negligible, although recent reports of DSi inputs from domestic and industrial sources suggest otherwise. In addition, particulate amorphous silica (ASi) inputs from terrestrial ecosystems during soil erosion and in vegetation can dissolve and also be a significant source of DSi. We quantify here both point and diffuse sources of DSi and particulate ASi to the Seine River watershed. The total per capita point source inputs of Si (DSi + ASi) were found to be 1.0 and 0.8 g Si inhabitant(-1) d(-1) in raw and treated waters of the Achères wastewater treatment plant, in agreement with calculations based on average food intake and silica-containing washing products consumption. A mass balance of Si inputs and outputs for the Seine drainage network was established for wet and dry hydrological conditions (2001 and 2003, respectively). Diffuse sources of Si are of 1775 kg Si km(-2) y(-1) in wet conditions and 762 kg Si km(-2) y(-1) in dry conditions, with the proportion of ASi around 6%. Point sources of Si from urban discharge can contribute to more than 8% of the total Si inputs at the basin scale in hydrologically dry years. An in-stream retention of 6% of total inputs in dry conditions and 12% in wet conditions is inferred from the budget.
Agata Sferratore; Josette Garnier; Gilles Billen; Daniel I Conley; Séverine Pinault
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  40     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-12-05     Completed Date:  2007-02-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6630-5     Citation Subset:  IM    
UMR Sisyphe, CNRS, Université Pierre et Marie Curie, Boite 105, 4 place Jussieu, F-75252 Paris, France.
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MeSH Terms
Environmental Monitoring / methods
Food Contamination / analysis*
Silicon / analysis
Silicon Dioxide / analysis*
Soil Pollutants / analysis*
Waste Disposal, Fluid
Water Movements
Water Pollutants
Water Purification / methods*
Reg. No./Substance:
0/Soil Pollutants; 0/Water Pollutants; 7440-21-3/Silicon; 7631-86-9/Silicon Dioxide

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