Wet deposition of mercury within the vicinity of a cement plant before and during cement plant maintenance |
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| Authors: | Sarah E Rothenberg Lester McKee Alicia Gilbreath Donald Yee Mike Connor Xuewu Fu |
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| Affiliation: | 1. U.S. Geological Survey, California Water Science Center, 6000 J Street, Placer Hall, Sacramento, CA 95819, United States;2. U.S. Environmental Protection Agency, Office of Environmental Assessment, EPA-Region 10, 1200 6th Ave., Suite 900, Seattle, WA 98101, United States;3. U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, 3200 SW Jefferson Way, Corvallis, OR 97331, United States;4. U.S. Geological Survey, Oregon Water Science Center, 2795 Anderson Ave., Suite 106, Klamath Falls, OR 97603, United States;5. U.S. Geological Survey, Oregon Water Science Center, 2130 SW 5th Ave., Portland, OR 97201, United States;1. Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA), Spanish Council for Scientific Research (CSIC), Jordi Girona, 18, 08034 Barcelona, Catalonia, Spain;2. Department of Applied Environmental Science (ITM) and the Bert Bolin Centre for Climate Research, Stockholm University, 10691 Stockholm, Sweden;3. Centre for Research in Environmental Epidemiology (CREAL), Dr Aiguader, 88, 08003 Barcelona, Catalonia, Spain;4. Universitat Pompeu Fabra, Dr Aiguader, 88, 08003 Barcelona, Catalonia, Spain |
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| Abstract: | Hg species (total mercury, methylmercury, reactive mercury) in precipitation were investigated in the vicinity of the Lehigh Hanson Permanente Cement Plant in the San Francisco Bay Area, CA., USA. Precipitation was collected weekly between November 29, 2007 and March 20, 2008, which included the period in February and March 2008 when cement production was minimized during annual plant maintenance. When the cement plant was operational, the volume weighted mean (VWM) and wet depositional flux for total Hg (HgT) were 6.7 and 5.8 times higher, respectively, compared to a control site located 3.5 km east of the cement plant. In February and March, when cement plant operations were minimized, levels were approximately equal at both sites (the ratio for both parameters was 1.1). Due to the close proximity between the two sites, meteorological conditions (e.g., precipitation levels, wind direction) were similar, and therefore higher VWM HgT levels and HgT deposition likely reflected increased Hg emissions from the cement plant. Methylmercury (MeHg) and reactive Hg (Hg(II)) were also measured; compared to the control site, the VWM for MeHg was lower at the cement plant (the ratio = 0.75) and the VWM for Hg(II) was slightly higher (ratio = 1.2), which indicated the cement plant was not likely a significant source of these Hg species to the watershed. |
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