Heavy metal contamination from historic mining in upland soil and estuarine sediments of Egypt Bay, Maine, USA

Abstract Concentrations of Cd, Cu, Pb and Zn in sediments of Egypt Bay in Hancock County, Maine, are elevated above background levels. The source of the contamination is Cu mining that occurred in the uplands adjacent to Egypt Stream between 1877 and 1885. Egypt Stream is a tributary to Egypt Bay. Egypt Bay is part of the Taunton Bay estuary system. The Hagan Mine was one of the mines extracting metals from the sulfide deposits in Downeast Maine north of Penobscot Bay. Metal concentrations were determined using ICP-AES after sample digestion with nitric acid. Soil collected from the coarse textured mine tailings pile contained elevated concentrations of Cd, Cu, Pb and Zn, but the majority of the surface soils at the Hagan Mine site were not contaminated. Estuary sediments from the surface to 100 cm depth were collected in four locations within Egypt Bay. Below 40 cm, metal concentrations in sediments were similar to those in uncontaminated upland soils. Metal concentrations in the estuary sediments between the surface and 26 cm were above background levels. According to 210 Pb dating, the sediment at 26–34 cm depth was likely to have been deposited at the time the historic mines were in operation. Concentrations of Cd, Cu, Pb, and Zn in sediment from the 32–34 cm depth interval are similar to concentrations in the upland soil sample from the mine tailings pile. Elevated Pb concentrations in sediments from the surface to 24 cm are from atmospheric Pb deposition from anthropogenic sources. Sediment in the top 10 cm of the estuary has been mixed both by the polychaete worm Nereis virens and by those harvesting the worms for sale as fish bait.

[1]  M. Jung,et al.  Heavy metal contamination in the vicinity of the Daduk Au-Ag-Pb-Zn mine in Korea , 2001 .

[2]  G. Bryan,et al.  Bioavailability, accumulation and effects of heavy metals in sediments with special reference to United Kingdom estuaries: a review. , 1992, Environmental pollution.

[3]  R. Hodder,et al.  Strata-bound massive sulfide deposits in Silurian-Devonian volcanic rocks at Harborside, Maine , 1984 .

[4]  R. Beltrán,et al.  Spatial variations of heavy metals contamination in sediments from Odiel river (Southwest Spain). , 2003, Environment international.

[5]  G. Bryan,et al.  Indicators of heavy-metal contamination in the Looe Estuary (Cornwall) with particular regard to silver and lead , 1977, Journal of the Marine Biological Association of the United Kingdom.

[6]  S. Vermette,et al.  The deposition and fate of trace metals in our environment. , 1992 .

[7]  Brian D. Smith,et al.  Enhanced food-chain transfer of copper from a diet of copper-tolerant estuarine worms , 2004 .

[8]  Bob Wilson,et al.  The dispersion of heavy metals in the vicinity of Britannia Mine, British Columbia, Canada. , 2005, Ecotoxicology and environmental safety.

[9]  G. Tuncer,et al.  Evolution of metal pollution in the golden horn (Turkey) sediments between 1912 and 1987. , 2001, Marine pollution bulletin.

[10]  R. Coveney,et al.  Environmental quality assessment on a river system polluted by mining activities , 2003 .

[11]  Murat Sezgin,et al.  Acute toxicity of zinc, copper and lead to three species of marine organisms from the Sinop Peninsula, Black Sea* , 1999 .

[12]  P. E. Gibbs,et al.  Copper, zinc, and organotin as long-term factors governing the distribution of organisms in the fal estuary in Southwest England , 1987 .

[13]  S. Luoma,et al.  Distribution, variability, and impacts of trace elements in San Francisco Bay , 1988 .

[14]  Gary Boone,et al.  Bedrock geologic map of Maine , 1985 .

[15]  L. J. Osher,et al.  Carbon Storage in the Soils of a Mesotidal Gulf of Maine Estuary , 2007 .

[16]  E. Galán,et al.  Clay mineral and heavy metal distributions in the lower estuary of Huelva and adjacent Atlantic shelf, SW Spain , 1997 .

[17]  A. Korhola,et al.  Searching for order in chaos: a sediment stratigraphical study of a multiple-impacted bay of the Baltic Sea , 2004 .

[18]  F. Grousset,et al.  A 70 year Record of Contamination from Industrial Activity Along the Garonne River and its Tributaries (SW France) , 1999 .

[19]  Frank Oldfield,et al.  The calculation of lead-210 dates assuming a constant rate of supply of unsupported 210Pb to the sediment , 1978 .

[20]  L. Anspaugh,et al.  The global impact of the Chernobyl reactor accident. , 1988, Science.

[21]  D. F. Covell,et al.  Determination of Gamma-Ray Abundance Directly from Total Absorption Peak , 1959 .

[22]  H. Pendias,et al.  Trace Elements in Soils and Plants, Third Edition , 2000 .

[23]  A. Kabata-Pendias.  Trace elements in soils and plants , 1984 .

[24]  P. Blier,et al.  Effects of temperature on in vitro sediment reworking processes by a gallery biodiffusor, the polychaete Neanthes virens , 2004 .

[25]  I. Pulford,et al.  Investigation of contaminant metal dispersal from a disused mine site at Tyndrum, Scotland, using concentration gradients and stable Pb isotope ratios , 2002 .

[26]  John W. Tukey,et al.  Exploratory Data Analysis. , 1979 .