title: Chemical stability of (99m)Tc-DTPA under aerobic and microbially mediated Fe(III)-reducing conditions in porous media.
abstract: (99m)Tc-DTPA has been used as a conservative tracer to quantify water transport through porous media. However, more information on the reactivity of this (99m)Tc compound under varying geochemical conditions is desirable to better understand its potential uses. We measured the speciation of Tc following amendment of (99m)Tc-DTPA to batch systems spanning a range of controlled biogeochemical conditions. Our results suggest that (99m)Tc-DTPA is stable under the reducing conditions tested. However, freshly precipitated Al-ferrihydrite may displace Tc(IV) from DTPA in the absence of Fe(III)-reducing conditions.
authors.affiliation: Geochemistry Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94207, United States.
authors.forename: Aaron J
authors.initials: AJ
authors.lastname: Slowey
authors.affiliation: Department of Radiotracer Development & Imaging Technology, Life Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, United States.
authors.forename: Nicholas T
authors.initials: NT
authors.lastname: Vandehey
authors.affiliation: Department of Radiotracer Development & Imaging Technology, Life Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, United States.
authors.forename: James P
authors.initials: JP
authors.lastname: O'Neil
authors.affiliation: Department of Radiotracer Development & Imaging Technology, Life Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, United States.
authors.forename: Rostyslav
authors.initials: R
authors.lastname: Boutchko
authors.affiliation: Department of Radiotracer Development & Imaging Technology, Life Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, United States.
authors.forename: William W
authors.initials: WW
authors.lastname: Moses
authors.affiliation: Geochemistry Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94207, United States. Electronic address: psnico@lbl.gov.
authors.forename: Peter S
authors.initials: PS
authors.lastname: Nico
mesh_terms: D001673:Biodegradation, Environmental; D004355:Drug Stability; D060587:Groundwater / Q000737:chemistry* / Q000382:microbiology*; D007501:Iron / Q000737:chemistry* / Q000378:metabolism*; D016062:Porosity; D020614:Shewanella putrefaciens / Q000737:chemistry* / Q000378:metabolism*; D016284:Technetium Tc 99m Pentetate / Q000032:analysis / Q000737:chemistry*
chemical_list: D007501:Iron; D016284:Technetium Tc 99m Pentetate
keywords: Chromium; Groundwater; Radiotracer; SPECT; Technetium; Tomography