Event Title

Selenium removal fluxes from the south-arm of the Great Salt Lake

Presenter Information

William Johnson

Location

ECC 307/309

Event Website

http://water.usu.edu/

Start Date

4-6-2007 10:50 AM

End Date

4-6-2007 11:20 AM

Description

Measurements were made during the period March 2006 through December 2006 to examine the existing distribution of selenium in the water and sediment of the south arm of the Great Salt Lake. Volatile selenium concentration was also measured across the south arm to develop estimated volatilization fluxes. Downward sedimentation fluxes were measured using sediment traps, and were compared to permanent sedimentation rates developed via isotopic analyses of sediment cores. Temperature readings from 6 depths at two sites in the south arm demonstrate periodic equilibration events consistent with temporary displacement of the deep brine layer, suggesting that anoxic sediments are periodically placed into contact with oxic shallow brine layer water, potentially leading to re-solubilization of selenium from the anoxic sediment. The combined selenium loss fluxes will be compared to estimated loading.

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Apr 6th, 10:50 AM Apr 6th, 11:20 AM

Selenium removal fluxes from the south-arm of the Great Salt Lake

ECC 307/309

Measurements were made during the period March 2006 through December 2006 to examine the existing distribution of selenium in the water and sediment of the south arm of the Great Salt Lake. Volatile selenium concentration was also measured across the south arm to develop estimated volatilization fluxes. Downward sedimentation fluxes were measured using sediment traps, and were compared to permanent sedimentation rates developed via isotopic analyses of sediment cores. Temperature readings from 6 depths at two sites in the south arm demonstrate periodic equilibration events consistent with temporary displacement of the deep brine layer, suggesting that anoxic sediments are periodically placed into contact with oxic shallow brine layer water, potentially leading to re-solubilization of selenium from the anoxic sediment. The combined selenium loss fluxes will be compared to estimated loading.

https://digitalcommons.usu.edu/runoff/2007/AllAbstracts/48