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Relationship Between pH and Stream Water Total Mercury Concentrations in Shenandoah National Park

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Abstract

The purpose of this study was to gather information on the spatial and temporal variation of stream water total mercury concentrations ([THg]) and to test the hypothesis that stream water [THg] increases as stream pH decreases in the Shenandoah National Park (SNP). We based our hypothesis on studies in lakes that found mercury methylation increases with decreasing pH, and studies in streams that found total mercury and other trace metal concentrations increase with decreasing pH. Stream water was collected at baseflow in SNP in April, July, and October 2005 and February 2006. Contrary to our hypothesis, stream water [THg] decreased with decreasing pH and acid neutralizing capacity. In SNP, stream pH and acid neutralizing capacity are strongly influenced by bedrock geology. We found that bedrock also influences stream water [THg]. Streams on basaltic bedrock had higher [THg] (0.648 ng L−1 ± 0.39) than streams on siliciclastic bedrock (0.301 ng L−1 ± 0.10) and streams on granitic bedrock (0.522 ng L−1 ± 0.06). The higher pH streams on basaltic bedrock had the highest [THg]. The variation in stream water [THg] occurred despite no known variation in wet deposition of mercury across the SNP. The findings of this study indicate that the SNP can be an important area for mercury research with significant variations in mercury concentrations across the park.

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Authors and Affiliations

  1. Appalachian Laboratory, University of Maryland Center for Environmental Science, 301 Braddock Road, Frostburg, MD, 21532, USA

    C. W. Moore & M. S. Castro

  2. Department of Environmental Sciences, University of Virginia, Charlottesville, VA, USA

    B. J. Cosby & J. N. Galloway

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  1. C. W. Moore
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  2. B. J. Cosby
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  3. J. N. Galloway
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  4. M. S. Castro
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Correspondence to C. W. Moore.

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Moore, C.W., Cosby, B.J., Galloway, J.N. et al. Relationship Between pH and Stream Water Total Mercury Concentrations in Shenandoah National Park. Water Air Soil Pollut 201, 233–238 (2009). https://doi.org/10.1007/s11270-008-9940-4

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  • DOI: https://doi.org/10.1007/s11270-008-9940-4

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