For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprodTo order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Huntington, T.G., Lewis, Ariel, Amirbahman, Aria, Marvin-DiPasquale, Mark, and Culbertson, C.W., 2015, Assessment of the use of sorbent amendments for reduction of mercury methylation in wetland sediment at Acadia National Park, Maine: U.S. Geological Survey Scientific Investigations Report 2014-5234, 30 p., http://dx.doi.org/10.3133/ sir20145234. ISSN 2328-0328 (online) iii AcknowledgmentsThe authors are grateful for the support they received from several people that contributed to the successful completion of this study. David Manski and Bill Gawley of Acadia National Park, National Park Service helped facilitate this report from the initial conceptualization of the study through completion. Clive Devoy at the University of Maine in Orono provided assistance with the chemical analysis of pore water and sediment at the Sawyer Environmental Laboratory.Martha Nielsen of the U.S. Geological Survey provided the map used in figure 1. Marie-Noële Croteau of the U.S. Geological Survey provided adult snails for rearing juveniles and provided assistance with the methods used to rear and process snails for analysis in experiments involving metal uptake. Evangelos Kakouros, Michelle Arias, and Le Kieu of the U.S. Geological Survey processed and analyzed sediment iron and mercury species and snail tissue for mercury species. Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as °F = (1.8 × °C) + 32. DatumVertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88). Horizontal coordinate information is referenced to North American Datum of 1983 (NAD 83).Altitude, as used in this report, refers to distance above the vertical datum. Supplemental InformationSpecific conductance is given in microsiemens per centimeter at 25 degrees Celsius (µS/cm at 25 °C).Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L) or micrograms per liter (µg/L). AbstractMercury is a contaminant of ecological concern because of its ubiquity and toxicity to fish and wildlife, and is considered a severe and ongoing threat to biota at Acadia National Park in Maine. The formation and biomagnification of methylmercury is the primary concern of resource managers at Acadia, and inf...
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