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Dendrochemical Record of Historical Lead Contamination Sources, Wells G&H Superfund Site, Woburn, Massachusetts

^a Dep. of Earth Sciences, Boston Univ., Boston, MA 02215
^b Geosciences Dep., Wellesley College, Wellesley, MA 02481
^c Dep. of Environmental, Earth and Ocean Sciences, Univ. of Massachusetts Boston, Boston, MA 02125

View larger version (33K): [in this window] [in a new window]   Fig. 1. Location map indicating the Wells G&H and Industriplex United States Environmental Protection Agency Superfund sites. The tree core described in this paper was sampled at the wetland upland boundary adjacent to Well G. Figure modified from (Aurilio et al., 1994).

View larger version (15K): [in this window] [in a new window]   Fig. 2. Lead isotope ratios of Aberjona red oak core annual rings, soils (this study), and Upper Mystic lake sediment and endmember Pb contamination sources (D. Brabander, unpublished secondary ion mass spectrometry data). Typical error bars for our laser ablation inductively coupled plasma mass spectrometry tree ring measurements are plotted in upper left for reference.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Annual values of 207Pb/206Pb for Aberjona red oak core. Error envelope indicates 2 sigma (95%) confidence range. Important features of this record are a sharp decline in of 207Pb/206Pb around 1972 and statistically significant interannual changes in 207Pb/206Pb. Horizontal lines indicate average 207Pb/206Pb for identified contaminant Pb sources.