Upper Midwest Environmental Sciences Center
Temporal and vertical distribution of total ammonia nitrogen and un-ionized ammonia nitrogen in sediment pore water from the Upper Mississippi River:
Sampling Purpose: In 1993, a study was designed through the University of Wisconsin-La Crosse, to assess temporal changes in un-ionized (NH3-N) concentrations in pore water to determine if NH3-N in sediments approach concentrations shown to have adverse effects on fingernail clams in experimental studies. Sediment core samples were obtained in Pool 8 of the Upper Mississippi River in areas currently and historically inhabited by fingernail clams. Specific objectives were (1) to examine the temporal and vertical distribution of total ammonia nitrogen (TAN) and NH3-N in pore water; (2) to compare the temporal patterns of TAN and NH3-N concentrations in overlying surface water with those in pore water; and (3) to examine the influence of sediment characteristics on TAN concentrations. In addition, sediment samples were analyzed for volatile matter, particle size, density, and water content.
Number of Observations (samples) in Data Set: 459
Institution Providing Data: University of Wisconsin-La Crosse
Data Set No. 9:
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Data source variables
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Sample variables
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Classes of Contaminants (in both data set 9 and other data sets)
Inorganic contaminants:
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Metals, metalloids, nutrients and others
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Content manager: Michelle Bartsch
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/data_library/sediments_contaminants/datasets/9.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified:
January 29, 2016
