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Groundwater Nanoparticles in the Far-Field at the Nevada Test Site: Mechanism for Radionuclide Transport
- Source :
- Environmental Science & Technology. 43:1293-1298
- Publication Year :
- 2009
- Publisher :
- American Chemical Society (ACS), 2009.
-
Abstract
- Colloid-like nanoparticles in groundwater have been shown to facilitate migration of several radionuclides: (239,240)Pu, 137Cs, (152,154, 155)Eu, and 60Co. However, the exact type of nanoparticle and the speciation of the associated radionuclides has remained unknown. We have investigated nanoparticles sampled from the far-field at the Nevada Test Site, Nevada, utilizing advanced electron microscopytechniques, including high-angle annular dark-field scanning TEM (HAADF-STEM). Fissiogenic elements: Cs, rare earth elements (REE), activation elements: Co; and actinides: U and Th, were detected. Cesium is associated with U-forming cesium uranate with a Cs/U atomic ratio of approximately 0.12. Light REEs and Th are associated with phosphates, silicates, or apatite. Cobalt occurs as a metallic aggregate, associated with Cr, Fe, Ni, and +/-Mo. Uranyl minerals; Na-boltwoodite and oxide hydrates are also present as colloids. Because of these chemical associations with nanoscale particles, in the size range
- Subjects :
- Radioisotopes
Radiochemistry
Thorium
chemistry.chemical_element
Mineralogy
General Chemistry
Actinide
Uranium
Elements
Uranium Compounds
Apatite
Motion
Soil
chemistry
Water Supply
Caesium
visual_art
visual_art.visual_art_medium
Nanoparticles
Environmental Chemistry
Colloids
Uranate
Cobalt
Groundwater
Nevada
Subjects
Details
- ISSN :
- 15205851 and 0013936X
- Volume :
- 43
- Database :
- OpenAIRE
- Journal :
- Environmental Science & Technology
- Accession number :
- edsair.doi.dedup.....70042a81c4e4907a259601fb1a1b84f3