Lead isotopic ratios in European atmospheric aerosols

Aerosols collected between 1994 and 1999 at more than 45 different sites in Europe have been measured for Ph isotopic composition and Ph concentration s by Thermal Ionisation Mass Spectrometry (TIMS). With respect to Pb-206/Pb -207 and Pb-208/Ph-207 ratios a change in isotopic composition compared wit h earlier measurements was detected in parts of Europe. Also, seasonal vari ations were observed at some sites. This was most probably due to a relativ e increase (due to the phasing out of leaded petrol) of both industrial Pb in the atmosphere and pollution from long- or meso-scale transport. (C) 200 1 Elsevier Science Ltd. All rights reserved.