Lead isotopes tracing the origin of lead in an irrigated agricultural soil in Crete

Lise Cary (1) , Wolfram Kloppmann (1) , Georgios Psarras (2)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 NAGREF - Institute for Olive Tree and Subtropical Plants

Measurements of the concentrations and isotopic composition of Pb in soil fractions in an irrigated cultivated soil profile developed on Miocene sediments in Crete are used to estimate the significance of soil-derived versus man-induced sources. In soil samples, lead concentrations are 7.1 ± 1 μg/g at shallow depth (40 cm), and reach 9.1 μg/g near the surface (10 cm). 206 Pb/ 207 Pb values range from 1.20 in shallow samples to 1.19 in the uppermost samples. In all the samples, the isotopic composition of Pb in the residual soil fraction, i.e. essentially silicate Pb, is slightly more radiogenic than in the soil mobile fraction. Pb in the EDTA-extracted fraction is anthropogenic Pb issuing most probably from Pb emitted in Greece.

Mots clés: Pb isotopes; soil fractions; agricultural soil

Domaines: Géochimie

Lise Cary, Wolfram Kloppmann, Georgios Psarras. Lead isotopes tracing the origin of lead in an irrigated agricultural soil in Crete. Procedia Earth and Planetary Science, 2015, ⟨10.1016/j.proeps.2015.07.064⟩. ⟨hal-01284918⟩