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• W1992862537 abstract "Environmental concern about Hg pollution in Lake Erie peaked in 1970 with most investigations being directed to the west end of the lake and problems associated with Lake St. Clair. The Ohio Geological Survey subsequently (1970–1971) collected and analyzed stream and lake sediments in the vicinity of several industrial areas that border Lake Erie and reported indications of Hg pollution along the lower reaches of the Ashtabula River. Neither the intensity, nor the center, of the contamination was recognized in that study. In 1970, however, the state began to monitor the levels of Hg in the industrial effluent of the area. During a re-investigation of pollution at Ashtabula, 68 sediment samples were collected across an area of 90 km2 in the late spring and early summer of 1982. The Hg that was released by heating the samples on a hot plate for one minute at 290°C was determined with a gold-film Hg detector. Mercury concentrations in the sediments had a median (background) value of 24.4 ppb and a mean content of 422 ppb, and exhibited a lognormal distribution that was bimodal. Three samples that ranged from 1550 to 20,600 ppb Hg are considered anomalous and come from the drainage of Fields Brook. Although no single industrial operation could be targeted as a source, high Hg levels apparently are due to the past accumulation of industrial waste. Mean Hg levels in the Ashtabula River samples from south and north of the junction with Fields Brook were 42.8 and 118.5 ppb Hg, respectively, indicating that contamination of the latter had occurred. The Lake Erie samples (mean ppb Hg) can be separated by the mouth of the Ashtabula River and the depth of the lake bottom as follows: west side (9.7), east side (59.8); and shoreline (15.8), nearshore (64.5). The six-fold increase on the eastern side of the harbor relative to the western side is believed to be due to the direction of the longshore currents which, in the Ashtabula area, run from southwest to northeast. The four-fold increase in Hg levels in nearshore sediments relative to those from the shoreline is due to preferential concentration in the finer size fraction. The Hg levels obtained for nearshore sediments just east of the Ashtabula River are six times higher than those reported earlier by the Geological Survey, suggesting that accumulation of Hg may have occurred." @default.
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• W1992862537 date "1987-01-01" @default.
• W1992862537 modified "2023-09-25" @default.
• W1992862537 title "Re-examination of Hg pollution in the Ashtabula area, Astabula County, Ohio" @default.
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• W1992862537 doi "https://doi.org/10.1016/0375-6742(87)90067-7" @default.
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