Levels of mercury in the sediments of some Swiss lakes including Lake Geneva and the Rhone river

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Levels of mercury in the sediments of some Swiss lakes including Lake Geneva and the Rhone river

VERNET, Jean-Pierre, THOMAS, Richard Lynn

Abstract

Les sédiments récoltés dans les lacs de Bienne, Brienz, Joux, Tuma, Saoseo, Bodan, Léman et dans le Rhône ont été analysés pour déterminer leur teneur en Hg/total. A l'exception du lac de Brienz tous les lacs présentent une contamination mercurielle due soit à la pollution atmosphérique soit à des sources industrielles ou urbaines. La teneur en mercure provenant de l'environnement géologique a été estimée comme étant au maximum de 200 ppb. Les lacs de Tuma et de Saoseo situés sur le versant sud des Alpes sont probablement pollués par les émissions dans l'atmosphère des complexes industriels de l'Italie du Nord, les vents prédominants venant de l'ouest et du sud-ouest. Le profil du Rhône montre des concentrations en mercure dans les canaux X, Y et Z et dans un affluent, la Drance, qui sont les sources industrielles de la contamination par le mercure du Rhône et du Léman. La répétition des campagnes d'échantillonnage entre 1964 et 1971 montre un apport important de mercure d'origine industrielle entre 1965 et 1967 et dès cette date un accroissement régulier des teneurs jusqu'en 1971.

VERNET, Jean-Pierre, THOMAS, Richard Lynn. Levels of mercury in the sediments of some Swiss lakes including Lake Geneva and the Rhone river. Eclogae Geologicae Helvetiae, 1972, vol. 65, no. 2, p. 293-306

DOI : 10.5169/seals-164093

Available at:

http://archive-ouverte.unige.ch/unige:145080

Disclaimer: layout of this document may differ from the published version.

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