Fig. 8.

Lead isotopic signatures found in contrasted soil/sediment samples collected in the Orge River catchment and in potential sources: (a) Lead isotopic signatures of French gasoline (Monna et al. 1997; Roy 1996); Industrial lead estimated from French Municipal Solid Waste Combustors from Sete and Paris (Monna et al. 1997; Widory et al. 2004); Road Deposit from the Orge (this study); Suspended Particulate Matter from the Orge River (this study); Local background (this study); Agricultural soil from Dourdan (this study) and channel bank (this study). (b) SPM lead signatures obtained at each river monitoring site (Dourdan (D): circle, Egly (E): inverted triangle, Yvette (Y): triangle, Viry (V): square) and for contrasted hydrological regimes (seasonal floods (SF): orange, low stage periods (LSP): blue)