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Title: Transport of Europium Colloids in Vadose Zone Lysimeters at the Semiarid Hanford Site

Abstract

The objective of this study was to quantify transport of Eu colloids in the vadose zone at the semiarid Hanford site. Eu-hydroxy-carbonate colloids, Eu(OH)-(CO 3), were applied to the surface of field lysimeters, and migration of the colloids through the sediments was monitored using wick samplers. The lysimeters were exposed to natural precipitation (145-231 mm/year) or artificial irrigation (124-348 mm/year). Wick outflow was analyzed for Eu concentrations, supplemented by electron microscopy and energy-dispersive X-ray analysis. Small amounts of Eu colloids (<1%) were detected in the deepest wick sampler (2.14 m depth) 2.5 months after application and cumulative precipitation of only 20 mm. We observed rapid transport of Eu colloids under both natural precipitation and artificial irrigation; that is, the leading edge of the Eu colloids moved at a velocity of 3 cm/day within the first 2 months after application. Episodic infiltration (e.g., Chinook snowmelt events) caused peaks of Eu in the wick outflow. While a fraction of Eu moved consistent with long-term recharge estimates at the site, the main mass of Eu remained in the top 30 cm of the sediments. This study illustrates that, under field conditions, near-surface colloid mobilization and transport occurred in Hanford sediments.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1082592
Report Number(s):
PNNL-SA-94191
Journal ID: ISSN 0013-936X; KP1702030
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 47; Journal Issue: 5; Journal ID: ISSN 0013-936X
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; wick sampler; europium; mobilization

Citation Formats

Liu, Ziru, Flury, Markus, Zhang, Z. Fred, Harsh, James B., Gee, Glendon W., Strickland, Chris E., and Clayton, Ray E. Transport of Europium Colloids in Vadose Zone Lysimeters at the Semiarid Hanford Site. United States: N. p., 2013. Web. doi:10.1021/es304383d.
Liu, Ziru, Flury, Markus, Zhang, Z. Fred, Harsh, James B., Gee, Glendon W., Strickland, Chris E., & Clayton, Ray E. Transport of Europium Colloids in Vadose Zone Lysimeters at the Semiarid Hanford Site. United States. doi:10.1021/es304383d.
Liu, Ziru, Flury, Markus, Zhang, Z. Fred, Harsh, James B., Gee, Glendon W., Strickland, Chris E., and Clayton, Ray E. Tue . "Transport of Europium Colloids in Vadose Zone Lysimeters at the Semiarid Hanford Site". United States. doi:10.1021/es304383d.
@article{osti_1082592,
title = {Transport of Europium Colloids in Vadose Zone Lysimeters at the Semiarid Hanford Site},
author = {Liu, Ziru and Flury, Markus and Zhang, Z. Fred and Harsh, James B. and Gee, Glendon W. and Strickland, Chris E. and Clayton, Ray E.},
abstractNote = {The objective of this study was to quantify transport of Eu colloids in the vadose zone at the semiarid Hanford site. Eu-hydroxy-carbonate colloids, Eu(OH)-(CO3), were applied to the surface of field lysimeters, and migration of the colloids through the sediments was monitored using wick samplers. The lysimeters were exposed to natural precipitation (145-231 mm/year) or artificial irrigation (124-348 mm/year). Wick outflow was analyzed for Eu concentrations, supplemented by electron microscopy and energy-dispersive X-ray analysis. Small amounts of Eu colloids (<1%) were detected in the deepest wick sampler (2.14 m depth) 2.5 months after application and cumulative precipitation of only 20 mm. We observed rapid transport of Eu colloids under both natural precipitation and artificial irrigation; that is, the leading edge of the Eu colloids moved at a velocity of 3 cm/day within the first 2 months after application. Episodic infiltration (e.g., Chinook snowmelt events) caused peaks of Eu in the wick outflow. While a fraction of Eu moved consistent with long-term recharge estimates at the site, the main mass of Eu remained in the top 30 cm of the sediments. This study illustrates that, under field conditions, near-surface colloid mobilization and transport occurred in Hanford sediments.},
doi = {10.1021/es304383d},
journal = {Environmental Science and Technology},
issn = {0013-936X},
number = 5,
volume = 47,
place = {United States},
year = {2013},
month = {3}
}