Speciation and origin of particulate copper in runoff water from a Mediterranean vineyard catchment.
Fungicide treatments have led to large copper contents of the topsoils of most vineyards. This paper examines the contamination of surface waters by copper in a Mediterranean wine-growing catchment. Its aims were to characterise the forms of copper associated with suspended matter during a heavy autumn storm event and to identify which soils contribute the most to the copper exports. A mixing model involving three reservoirs, corresponding to three soil-landscape units (plateau, terraces and footslope-depression system) and two tracers (reducible iron content and dolomite/calcite ratio) was used to estimate the contribution of each reservoir to erosion during a storm flow. The average copper concentration of the suspended matter was 245 mg kg(-1), of which 1% was exchangeable, 4% acid-soluble, 10% oxidizable, 23% reducible and 63% residual. The soils of the plateau of the catchment (chromic luvisols and haplic calcisols-FAO soil classification) were the source of 42% of copper exports but represented only 27% of the total catchment area.
Ribolzi
O
O
Unité de Science du Sol INRA, Montfaret, France.
Valles
V
V
Gomez
L
L
Voltz
M
M
D000383:Agriculture; D003300:Copper / Q000032:analysis* / Q000737:chemistry*; D004784:Environmental Monitoring; D005659:Fungicides, Industrial; D012989:Soil Pollutants / Q000032:analysis*; D014872:Water Movements; D014881:Water Supply; D014920:Wine
D005659:Fungicides, Industrial; D012989:Soil Pollutants; D003300:Copper