History of toxic metal discharge to surface waters of the Aberjona Watershed

Article Abstract:

Sediment cores from the Upper Mystic Lake, along with historical documents of industrial activity, were analyzed to trace the history of waterborne export of toxic metals from the Aberjona Watershed, north of Boston, MA. High metals concentrations are in two zones in the sediments of the lake. The zone with a depth of between 50 and 70 cm. is linked to the early 1900s when industrial activity was at its peak and chemical and leather industries directly discharged metals to the waters. Concentrations decreased as industry floundered after the mid-1930s. The remobilization of wastes from the watershed decades earlier resulted in metals transport to the lake in the 1960s.

Analysis, History, Watersheds, Hazardous wastes, Lake sediments

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Laboratory studies

Article Abstract:

Laboratory experiments were conducted to determine in-situ biodegradation rates for a toluene-contaminated stream in Wilmington and Woburn, MA. Results revealed that biodegradation rates obtained from batch studies on the laboratory were similar to the those observed in field investigations. Rates obtained from column studies, however, were only 2% of those found in-situ. Almost all degradation can be attributed to streambed surfaces.

Research, Biodegradation, Toluene

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Interannual variability in the speciation and mobility of arsenic in a dimictic lake

Article Abstract:

Arsenic speciation and concentration in the Upper Mystic Lake were investigated using hydride generation methods and atomic absorption. The results showed that high amounts of As and the predominance of highly-toxic As(III) occur in environments where sulfide persists. Enhanced human exposure is still possible even if redox interfaces and limits the natural movement of As.

Lakes, Arsenic

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