Accession Number : ADA304855

Title :   Internal Phosphorus Loading in Lake Pepin (Minnesota-Wisconsin).

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s) : James, William F. ; Berko, John W. ; Eakin, Harry L.

PDF Url : ADA304855

Report Date : DEC 1995

Pagination or Media Count : 19

Abstract : 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 /sq m/day under oxic and anoxic conditions, respectively. Independently determined Fickean diffusional fluxes (mean of 4.9 mg /sq m/day), 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 NHl4Cl- 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. jg p19

Descriptors :   *PHOSPHORUS, *SEDIMENTS, CALCIUM, CORES, RATES, IRON, OXYGEN, INTERNAL, ALUMINUM, DAY, STORAGE, WATER QUALITY, MISSISSIPPI RIVER, PH FACTOR, INORGANIC COMPOUNDS, SODIUM HYDROXIDE.

Subject Categories : Geology, Geochemistry and Mineralogy
      Inorganic Chemistry
      Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE