Event Title

RE(VII) Reduction in the Presence of Sorbed FE(II): Plausbile Removal Pathway in Suboxic Porewaters

Location

CSU Ballroom

Start Date

16-4-2013 10:00 AM

End Date

16-4-2013 12:00 PM

Student's Major

Chemistry and Geology

Student's College

Science, Engineering and Technology

Mentor's Name

Trenton Vorlicek

Mentor's Department

Chemistry and Geology

Mentor's College

Science, Engineering and Technology

Description

Re deposition is generally thought to involve reduction. Unfortunately, the pathway to Re removal remains unclear. Authors purport Re sequestration begins in suboxic (absence of oxygen and sulfide) environments; others produce evidence supporting removal under anoxic (presence of sulfide) conditions. This research aims to clarify such issues by positing a plausible to Re fixation in suboxic sediments. While reduction of Tc(VII) is known to be strongly favored in the presence of alumina- sorbed Fe(II), analogous behavior for Re(VII) has not been established. Preliminary glovebox experiments involve reacting 10 µM ReO4- at pH=7.0 in the presence of 100 µM Fe(II), hydrated o- alumina, or hydrated o-alumina previously exposed to 100 µM Fe(II). At various times, aliquots of test solutions are filtered (0.45 µm) and ReO4- quantified using reverse phase ion pair chromatography with suppressed conductivity detection. For comparison similar experiments involving Mo(VI) (MoO42-) will also be performed and presented.

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Apr 16th, 10:00 AM Apr 16th, 12:00 PM

RE(VII) Reduction in the Presence of Sorbed FE(II): Plausbile Removal Pathway in Suboxic Porewaters

CSU Ballroom

Re deposition is generally thought to involve reduction. Unfortunately, the pathway to Re removal remains unclear. Authors purport Re sequestration begins in suboxic (absence of oxygen and sulfide) environments; others produce evidence supporting removal under anoxic (presence of sulfide) conditions. This research aims to clarify such issues by positing a plausible to Re fixation in suboxic sediments. While reduction of Tc(VII) is known to be strongly favored in the presence of alumina- sorbed Fe(II), analogous behavior for Re(VII) has not been established. Preliminary glovebox experiments involve reacting 10 µM ReO4- at pH=7.0 in the presence of 100 µM Fe(II), hydrated o- alumina, or hydrated o-alumina previously exposed to 100 µM Fe(II). At various times, aliquots of test solutions are filtered (0.45 µm) and ReO4- quantified using reverse phase ion pair chromatography with suppressed conductivity detection. For comparison similar experiments involving Mo(VI) (MoO42-) will also be performed and presented.

Recommended Citation

Wagner, Clayton; Paul Yanez; and Megan Maloney. "RE(VII) Reduction in the Presence of Sorbed FE(II): Plausbile Removal Pathway in Suboxic Porewaters." Undergraduate Research Symposium, Mankato, MN, April 16, 2013.
http://cornerstone.lib.mnsu.edu/urs/2013/poster-session-A/33