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Trace Metal Leaching through a Soil–Grassland System after Sewage Sludge Application

^a Swiss Federal Institute of Technology (EPFL), ENAC-ISTE-LPE, Ecublens, 1015 Lausanne, Switzerland
^b Agriculture and Environment Division, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK

View larger version (34K): [in a new window]   Fig. 1. Evolution of Cd, Cu, Ni, and Ca for a period of 3 mo before and 37 mo after (Day -80 to Day 1125) sewage sludge application. * refers to sludge applications at Days 0 (Month 0), 340 (Month 11), and 522 (Month 17). Values between -80 and 0 correspond to analysis performed on soil waters before the first sludge application.

View larger version (30K): [in a new window]   Fig. 2. Evolution of NO3–N, Cl, and dissolved organic carbon (DOC) concentrations and pH for a period of 3 mo before and 37 mo after (Day -80 to Day 1125) sewage sludge application. * refers to sludge applications at Days 0 (Month 0), 340 (Month 11), and 522 (Month 17). Values between -80 and 0 correspond to analysis performed on soil waters before the first sludge application.

View larger version (19K): [in a new window]   Fig. 3. Percentage of element leached that was associated with particulate matter. Mean of all lysimeters calculated for 6 mo between Months 0 and 6.