Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/4380
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dc.contributorMetropolitan Council of the Twin Cities Area-
dc.contributorWater Operations Technical Support Program (U.S.)-
dc.contributor.authorJames, William F., Aquatic biologist-
dc.contributor.authorBarko, John W.-
dc.contributor.authorEakin, Harry L.-
dc.date.accessioned2016-03-16T19:36:05Z-
dc.date.available2016-03-16T19:36:05Z-
dc.date.issued1995-12-
dc.identifier.urihttp://hdl.handle.net/11681/4380-
dc.descriptionTechnical Report-
dc.descriptionAbstract: This study examined rates of internal phosphorus (P) loading from sediments in Lake Pepin, a natural impoundment located on the upper Mississippi River. Laboratory determinations of rates of P release from the sediment, measured using intact sediment core systems, were very high, with mean values ranging from 3.8 to 15 mg m⁻² day⁻¹ under oxic and anoxic conditions, respectively. Independently determined Fickean diffusional fluxes (mean of 4.9 mg m⁻² day⁻¹), measured in situ under oxic conditions using sediment peepers, were not statistically different from those rates determined in the laboratory under similar temperature, pH, and oxygen conditions. The dominant inorganic P fractions in the sediments were NaOH-extractable P followed closely by HCl-extractable P. Under both oxic and anoxic conditions, significant correlations existed between rates of P release and the NH4Cl- and NaOH-extractable P fractions, suggesting that loosely bound and iron- and aluminum-bound sediment P contributed to P release from the sediments in this lake. Correlations between total sediment P and extractable sediment P fractions indicated that loosely bound and iron- and aluminum-bound P increased, while calcium-bound P decreased, with increasing total P content of the sediment. Results suggest that internal P loading from the sediments under oxic as well as anoxic conditions can play a very important role in the P economy of this system.-
dc.publisherEnvironmental Laboratory (U.S.)-
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relationhttp://acwc.sdp.sirsi.net/client/en_US/search/asset/1040901-
dc.rightsApproved for public release; distribution is unlimited.-
dc.sourceThis Digital Resource was created from scans of the Print Resource-
dc.subjectAnoxia-
dc.subjectPhosphorus-
dc.subjectPorewater phosphorus-
dc.subjectWater quality-
dc.subjectSediment-
dc.subjectSediment phosphorus fractions-
dc.subjectLake Pepin-
dc.titleInternal phosphorus loading in Lake Pepin (Minnesota-Wisconsin)-
dc.typeReporten_US
Appears in Collections:Technical Report

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