Open-File Report 2008-1279
National Water-Quality Assessment Program
By Michelle A. Lutz, Mark E. Brigham, and Mark Marvin-DiPasquale
Mercury (Hg) contamination is an issue of national concern, affecting both wildlife and human health. The U.S. Geological Survey (USGS) National Water-Quality Assessment (NAWQA) Program, in association with the USGS Toxic Substances Hydrology Program and the USGS National Research Program, has initiated two levels of studies to investigate Hg contamination of the Nationís streams: reconnaissance and detailed studies. Reconnaissance studies entailed one-time sampling events at 266 stream sites across the Nation. Detailed studies entailed intensive spatial and temporal sampling of a small number of streams across the Nation in an effort to develop a more complete, process-level understanding of benthic Hg geochemistry and the underlying factors controlling it. This report summarizes the sampling methods used for the collection and processing of streambed sediment and pore water in association with both of these study levels. Bed-sediment characteristics, such as organic content and grain size, strongly influence Hg geochemistry; detailed characterization of these constituents within a stream reach will allow for the extrapolation of related Hg biogeochemical constituents to the reach scale.
Appendix 1. Method Summary Sheets
Appendix 2. Primary and Ancillary Constituents Analyzed for in Bed Sediment and Pore Water Collected for the National Water-Quality Assessment (NAWQA) Program Detailed Mercury Studies
Appendix 3. Field Forms
Appendix 4. Sample Labels
Appendix 5. Equipment Required for Bed-Sediment and Pore-Water Sampling in Association with the National Water-Quality Assessment (NAWQA) Program Reconnaissance and Detailed Mercury Studies
Appendix 6. Laboratory Contact Information for U.S. Geological Survey Laboratories Performing Analyses for the National Water-Quality Assessment (NAWQA) Program Reconnaissance and Detailed Mercury Studies
Appendix 7. Shipping Forms for Reconnaissance and Detailed Studies
|General sampling form||PDF, 77 KB|
|Reach establishment||PDF, 195 KB|
|Reach diagram||PDF, 81 KB|
|Transect sampling||PDF, 289 KB|
|Methylmercury production- and degradation-potential rates||PDF, 222 KB|
|Pore-water sulfide||PDF, 70 KB|
|Generic shipping form for the methylmercury production- and degradation-potential-rates laboratory, the Wisconsin Mercury Research Laboratory (for transect samples only), the carbon geochemistry laboratory, and the sulfur geochemistry laboratory.||PDF, 172 KB|
|Analytical services request form for the Wisconsin Mercury Research Laboratory (WMRL) - Page 1||PDF, 67 KB|
|Analytical services request form for the Wisconsin Mercury Research Laboratory (WMRL) - Page 2||PDF, 90 KB|
|Cooler inventory form for the Wisconsin Mercury Research Laboratory (WMRL)||PDF, 73 KB|
|Shipping form for the Iowa City Sediment Laboratory (ISCL) - Page 1||PDF, 197 KB|
|Shipping form for the Iowa City Sediment Laboratory (ISCL) - Page 2||PDF, 193 KB|
|Sample labels: reconnaissance studies||DOC, 31 KB|
|Sample labels: detailed studies||DOC, 38 KB|
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Send questions or comments about this report to the author, M.A. Lutz, (608) 821-3816.