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.
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.
https://cornerstone.lib.mnsu.edu/urs/2013/poster-session-A/33
