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Use of tree rings to investigate the onset of contamination of a shallow aquifer by chlorinated hydrocarbons

Journal of Contaminant Hydrology

By:
, ,
DOI: 10.1016/S0169-7722(01)00117-6

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Abstract

Oaks (Quercus velutina Lam.) growing over a shallow aquifer contaminated by chlorinated hydrocarbons were studied to determine if it was possible to estimate the approximate year that contamination began. The annual rings of some trees downgradient from the contaminant release site contained elevated concentrations of chloride possibly derived from dechlorination of contaminants. Additionally, a radial-growth decline began in these trees at approximately the same time that chloride became elevated. Growth did not decline in trees that contained smaller concentrations of chloride. The source of elevated chloride and the corresponding reductions in tree growth could not be explained by factors other than contamination. On the basis of tree-ring evidence alone, the release occurred in the late 1960s or early 1970s. Contaminant release at a second location apparently occurred in the mid- to late 1970s, suggesting that the area was used for disposal for at least 5 years and possibly longer. Copyright ?? 2001 Elsevier Science B.V.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Use of tree rings to investigate the onset of contamination of a shallow aquifer by chlorinated hydrocarbons
Series title:
Journal of Contaminant Hydrology
DOI:
10.1016/S0169-7722(01)00117-6
Volume
50
Issue:
3-4
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Contaminant Hydrology
First page:
159
Last page:
173
Number of Pages:
15