PMID- 16786689
OWN - NLM
STAT- MEDLINE
DCOM- 20061122
LR  - 20190715
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 40
IP  - 11
DP  - 2006 Jun 1
TI  - Sorption of Am(III) onto 6-line-ferrihydrite and its alteration products: 
      investigations by EXAFS.
PG  - 3522-8
AB  - For the long-term performance assessment of nuclear waste repositories, knowledge 
      about the interactions of actinide ions with mineral surfaces such as iron oxides 
      is imperative. The mobility of released radionuclides is strongly dependent on 
      the sorption/desorption processes at these surfaces and on their incorporation 
      into the mineral structure. In this study the interaction of Am(III) with 
      6-line-ferrihydrite (6LFh) was investigated by EXAFS spectroscopy. At low pH 
      values (pH 5.5), as well at higher pH values (pH 8.0), Am(III) sorbs as a 
      bidentate corner-sharing species onto the surface. Investigations of the 
      interaction of Am(III) with Fh coated silica colloids prove the sorption onto the 
      iron coating and not onto the silica substrate. Hence, the presence of Fh, even 
      as sediment coating, is the dominant sorption surface. Upon heating, Fh is 
      transformed into goethite and hematite as shown by TEM and IR measurements. The 
      results of the fit to the EXAFS data indicate the release of sorbed Am(III) at pH 
      5.5 during the transformation and likely a partial incorporation of Am into the 
      Fh transformation products at pH 8.0.
FAU - Stumpf, Silvia
AU  - Stumpf S
AD  - Institut de Recherches Subatomiques, 23 Rue du Loess, P.O. Box 28, 67037 
      Strasbourg, France. silvia.stumpf@ires.in2p3.fr
FAU - Stumpf, Thorsten
AU  - Stumpf T
FAU - Dardenne, Kathy
AU  - Dardenne K
FAU - Hennig, Christoph
AU  - Hennig C
FAU - Foerstendorf, Harald
AU  - Foerstendorf H
FAU - Klenze, Reinhardt
AU  - Klenze R
FAU - Fanghanel, Thomas
AU  - Fanghanel T
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Ferric Compounds)
RN  - 0 (Iron Compounds)
RN  - 0 (Minerals)
RN  - 0 (Radioactive Waste)
RN  - 1310-14-1 (goethite)
RN  - 87PZU03K0K (ferric oxyhydroxide)
RN  - VW92PHU2UY (Americium)
SB  - IM
MH  - Americium/analysis/*chemistry
MH  - Ferric Compounds/analysis/*chemistry
MH  - Hydrogen-Ion Concentration
MH  - Iron Compounds/analysis/chemistry
MH  - Minerals
MH  - Models, Chemical
MH  - Radioactive Waste/analysis
MH  - Spectrophotometry, Infrared/methods
MH  - Spectrum Analysis/methods
EDAT- 2006/06/22 09:00
MHDA- 2006/12/09 09:00
CRDT- 2006/06/22 09:00
PHST- 2006/06/22 09:00 [pubmed]
PHST- 2006/12/09 09:00 [medline]
PHST- 2006/06/22 09:00 [entrez]
AID - 10.1021/es052518e [doi]
PST - ppublish
SO  - Environ Sci Technol. 2006 Jun 1;40(11):3522-8. doi: 10.1021/es052518e.