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UID:0-7505@eng.ufl.edu
DTSTART;TZID=America/New_York:20250403T135500
DTEND;TZID=America/New_York:20250403T145500
DTSTAMP:20250324T184122Z
URL:https://www.eng.ufl.edu/news-events/events/ne-seminar-technetium-bioge
 ochemistry-work-done-at-helmholtz-zentrum-dresden-rossendorf/
SUMMARY:NE Seminar: "Technetium Biogeochemistry: Work Done at Helmholtz-Zen
 trum Dresden-Rossendorf"
DESCRIPTION:Abstract\nTechnetium-99 (Tc) is a long-lived isotope produced i
 n high yield from the fission of U-235 and Pu-239\, contributing significa
 ntly to nuclear waste doses. It is also a decay product of Tc-99m\, a wide
 ly used medical radioisotope\, which is regularly discharged into sewage. 
 The environmental release of Tc-99 raises health concerns due to prolonged
  exposure risks.\nImmobilization of Tc is mainly achieved through redox st
 ate changes\, reducing mobile Tc (VII) (TcO₄⁻) to less soluble Tc (IV)
  species (e.g.\, TcO₂\, TcSₓ) via interaction with minerals like FeII-
 sulfides\, layered double hydroxides\, or magnetite. However\, complexing 
 ligands (e.g.\, carbonate) can hinder Tc immobilization.\nAt Helmholtz-Zen
 trum Dresden-Rossendorf\, our group studies Tc biogeochemistry through int
 eractions with microorganisms\, metabolites\, and Fe (II) minerals to simu
 late environmental conditions. This talk will cover: i) Tc immobilization 
 by biogenic vs. synthetic vivianite\, ii) structural insights into Tc (IV)
  and Tc (III) carbonate complexes\, and iii) the impact of metabolites on 
 Tc removal by pyrite.\nIn addition\, we are developing methods to visualiz
 e in situ the redox triggered reactions in solution by coupling spectrosco
 py and electrochemistry. Some of our updated results will be shown.\nBio\n
 Natalia Mayordomo Herranz\, Ph.D.\nGroup Leader\nHelmholtz-Zentrum Dresden
 -Rossendorf\nDr. Natalia Mayordomo Herranz: I obtained my bachelor (licenc
 iate) degree at Universidad de Alcalá (Spain) in 2010. At the same Univer
 sity\, I finished my master’s degree in 2011. In 2012 I started my Ph.D.
  at the Center of energetic\, environmental and technological research (CI
 EMAT) in Madrid (Spain). My PhD dealt with the experimental and theoretica
 l sorption of Se (IV)\, Sr (II)\, Cd (II)\, and U(VI) on mixtures of alumi
 na and bentonite. After finishing my PhD in 2017\, I started my postdoc at
  Helmholtz-Zentrum Dresden-Rossendorf (HZDR\, in Dresden Germany)\, where 
 I have been mainly focused on Tc immobilization. Since July 2022 I am a yo
 ung investigator group leader. I gain a 2 M€ grant to have my team mainl
 y working on Tc biogeochemistry\, and the improvement on understanding of 
 redox-triggered processes. I also lecture at Technische Universität Dresd
 en (Germany)\, and I am enrolled on writing my habilitation.
CATEGORIES:Seminars
LOCATION:Rhines Hall Room 125\, 549 Gale Lemerand Drive\, Gainesville\, FL\
 , 32611\, United States
GEO:29.644403;-82.350403
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=549 Gale Lemerand Drive\, G
 ainesville\, FL\, 32611\, United States;X-APPLE-RADIUS=100;X-TITLE=Rhines 
 Hall Room 125:geo:29.644403,-82.350403
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