Groundwater nanoparticles in the far-field at the nevada test site: Mechanism for radionuclide transport

Satoshi Utsunomiya, Annie B. Kersting, Rodney C. Ewing

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Colloid-like nanoparticles in groundwater have been shown to facilitate migration of several radionuclides: 239,240Pu, 137Cs, 152,154,155Eu, and 60Co (1). 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 microscopy techniques, 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 ∼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 <100 nm, these particles may facilitate transport, and a variety of trace nanoscale phases may be responsible for the migration of fissiogenic and actinide elements in groundwater. To accurately model the transport of these contaminants, predictive transport models should include consideration of nanoparticle-facilitated transport.

Original languageEnglish
Pages (from-to)1293-1298
Number of pages6
JournalEnvironmental Science and Technology
Volume43
Issue number5
DOIs
Publication statusPublished - Mar 1 2009

Fingerprint

Radioisotopes
radionuclide
Groundwater
Actinoid Series Elements
Nanoparticles
Cesium
actinide
groundwater
cesium
Colloids
colloid
rare earth element
Silicates
Apatites
pollutant transport
Cobalt
Hydrates
Rare earth elements
electron microscopy
cobalt

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Groundwater nanoparticles in the far-field at the nevada test site : Mechanism for radionuclide transport. / Utsunomiya, Satoshi; Kersting, Annie B.; Ewing, Rodney C.

In: Environmental Science and Technology, Vol. 43, No. 5, 01.03.2009, p. 1293-1298.

Research output: Contribution to journalArticle

@article{6131d182c3f9438abae7e74a6ca0e21e,
title = "Groundwater nanoparticles in the far-field at the nevada test site: Mechanism for radionuclide transport",
abstract = "Colloid-like nanoparticles in groundwater have been shown to facilitate migration of several radionuclides: 239,240Pu, 137Cs, 152,154,155Eu, and 60Co (1). 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 microscopy techniques, 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 ∼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 <100 nm, these particles may facilitate transport, and a variety of trace nanoscale phases may be responsible for the migration of fissiogenic and actinide elements in groundwater. To accurately model the transport of these contaminants, predictive transport models should include consideration of nanoparticle-facilitated transport.",
author = "Satoshi Utsunomiya and Kersting, {Annie B.} and Ewing, {Rodney C.}",
year = "2009",
month = "3",
day = "1",
doi = "10.1021/es802181t",
language = "English",
volume = "43",
pages = "1293--1298",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "5",

}

TY - JOUR

T1 - Groundwater nanoparticles in the far-field at the nevada test site

T2 - Mechanism for radionuclide transport

AU - Utsunomiya, Satoshi

AU - Kersting, Annie B.

AU - Ewing, Rodney C.

PY - 2009/3/1

Y1 - 2009/3/1

N2 - Colloid-like nanoparticles in groundwater have been shown to facilitate migration of several radionuclides: 239,240Pu, 137Cs, 152,154,155Eu, and 60Co (1). 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 microscopy techniques, 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 ∼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 <100 nm, these particles may facilitate transport, and a variety of trace nanoscale phases may be responsible for the migration of fissiogenic and actinide elements in groundwater. To accurately model the transport of these contaminants, predictive transport models should include consideration of nanoparticle-facilitated transport.

AB - Colloid-like nanoparticles in groundwater have been shown to facilitate migration of several radionuclides: 239,240Pu, 137Cs, 152,154,155Eu, and 60Co (1). 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 microscopy techniques, 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 ∼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 <100 nm, these particles may facilitate transport, and a variety of trace nanoscale phases may be responsible for the migration of fissiogenic and actinide elements in groundwater. To accurately model the transport of these contaminants, predictive transport models should include consideration of nanoparticle-facilitated transport.

UR - http://www.scopus.com/inward/record.url?scp=64349094214&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=64349094214&partnerID=8YFLogxK

U2 - 10.1021/es802181t

DO - 10.1021/es802181t

M3 - Article

C2 - 19350893

AN - SCOPUS:64349094214

VL - 43

SP - 1293

EP - 1298

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

IS - 5

ER -