Dendrochemistry of multiple releases of chlorinated solvents at a former industrial site
2012
Balouet , Jean Christophe (International Environmental, Orrouy(France).) | Burken , Joel G. (University of Missouri, Missouri(Etats-Unis).) | Karg , Frank (HPC R&D Division, Noyal-Chatillon(France).) | Vroblesky , Don (U.S. Geology Survey, Columbia(Etats-Unis).) | Smith , Kevin T. (USDA Forest Service, Northern Research Station, New Hampshire(Etats-Unis).) | Grudd , Hakan (Stockholm University, Stockholm(Suède). Bert Bolin Centre for Climate Research, Department of Physical Geography and Quaternary Geology) | Rindby , Anders (Cox Anatytical Systems(Suède).) | Beaujard , Francois (INRA , Clermont-Ferrand (France). UMR 0547 Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier) | Chalot , Michel (INRA , Champenoux (France). UMR 1136 Interactions Arbres/Micro-organismes)
Trees can take up and assimilate contaminants from the soil, subsurface, and groundwater. Contaminants in the transpiration stream can become bound or incorporated into the annual rings formed in trees of the temperate zones. The chemical analysis of precisely dated tree rings, called dendrochemistry, can be used to interpret past plant interactions with contaminants. This investigation demonstrates that dendrochemistry can be used to generate historical scenarios of past contamination of groundwater by chlorinated solvents at a site in Verl, Germany. Increment cores from trees at the Verl site were collected and analyzed by energy-dispersive X-ray fluorescence (EDXRF) line scanning. The EDXRF profiles showed four to six time periods where tree rings had anomalously high concentrations of chlorine (Cl) as an indicator of potential contamination by chlorinated solvents.
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