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in creator/contributor: "Gu, B."  
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Anion retention in soil: Possible application to reduce migration of buried technetium and iodine

Description: This report summarizes a literature review of our present knowledge of the anion exchange properties of a number of soils and minerals, which may potentially be used as anion exchangers to retard migration of such anions as iodide (I{sup {minus}}), iodate (IO{sub 3}{sup {minus}}) and pertechnetate (TcO{sub 4}{sup {minus}}) away from disposal site. The amorphous clays allophane and imogolite, are found to be among the most important soil components capable of developing appreciable amounts of po… more
Date: October 1, 1991
Creator: Gu, B. & Schulz, R.K. (California Univ., Berkeley, CA (United States). Dept. of Soil Science)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chlorine-36 abundance in natural and synthetic perchlorate

Description: Perchlorate (ClO{sub 4}{sup -}) is ubiquitous in the environment. It occurs naturally as a product of atmospheric photochemical reactions, and is synthesized for military, aerospace, and industrial applications. Nitrate-enriched soils of the Atacama Desert (Chile) contain high concentrations of natural ClO{sub 4}{sup -}; nitrate produced from these soils has been exported worldwide since the mid-1800's for use in agriculture. The widespread introduction of synthetic and agricultural ClO{sub 4}{… more
Date: January 1, 2009
Creator: Heikoop, Jeffrey M; Dale, M; Sturchio, Neil C; Caffee, M; Belosa, A D; Heraty, Jr., L J et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Detection of Perchlorate Anion on Functionalized Silver Colloids Using Surface-Enhanced Raman Scattering

Description: Perchlorate anion interferes with the uptake of iodide by the human thyroid gland and consequently disrupts the regulation of metabolism. Chronic exposure to high levels of perchlorate may lead to the formation of thyroid gland tumors. Although the Environmental Protection Agency (EPA) has not set a maximum contaminant level (MCL) for perchlorate, a draft drinking water range of 4-18 ppb based on 2 liter daily consumption of water has been established. The current EPA approved method for detect… more
Date: January 1, 2005
Creator: Tio, J.; Wang, W. & Gu, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Assessment of the influences of groundwater colloids on the migration of technetium-99 at the Paducah Gaseous Diffusion Plant Site in Paducah, Kentucky

Description: This short report summarizes the influences of groundwater colloids on the migration/transport of {sup 99}Tc at the Paducah Gaseous Diffusion Plant (PGDP) site in Paducah, Kentucky. Limited data suggest that inorganic colloidal materials (e.g., aluminosilicate clay minerals) may not play a significant role in the retention and transport of Tc. Studies by size fractionation reveal that both Tc and natural organic matter (NOM) are largely present in the <3K fraction. The role of NOM on Tc retenti… more
Date: July 1, 1994
Creator: Gu, B.; McDonald, J. A.; McCarthy, J. F. & Clausen, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Degradation of trichloroethylene (TCE) and polychlorinated biphenyls (PCBs) by Fe and Fe-Pd bimetals in the presence of surfactants and cosolvents

Description: Surfactants and cosolvents are being used to enhance the removal of dense non-aqueous phase liquids (DNAPL) such as trichloroethylene (TCE) and polychlorinated biphenyls (PCBS) from contaminated soils. However, the waste surfactant solution containing TCE and PCBs must be treated before it can be disposed. This study evaluated the use of zero-valence iron and palladized iron fillings on the dechlorination of TCE and a PCB congener in a dihexylsulfosuccinate surfactant solution. Batch experiment… more
Date: February 1, 1997
Creator: Gu, B.; Liang, L.; West, O.R.; Cameron, P. & Davenport, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An investigation of groundwater organics, soil minerals, and activated carbon on the complexation, adsorption, and separation of technetium-99

Description: This report summarizes studies on the interactions of technetium-99 (Tc) with different organic compounds and soil minerals under both oxidizing and reducing conditions. The report is divided into four parts and includes (1) effect of natural organic matter (NOM) on the complexation and solubility of Tc, (2) complexation between Tc and trichloroethylene (TCE) in aqueous solutions, (3) adsorption of Tc on soil samples from Paducah Gaseous Diffusion Plant (PGDP), and (4) adsorption and separation… more
Date: January 1, 1996
Creator: Gu, B. & Dowlen, K.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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In situ treatment of mixed contaminants in groundwater: Application of zero-valence iron and palladized iron for treatment of groundwater contaminated with trichloroethene and technetium-99

Description: The overall goal of this portion of the project was to package one or more unit processes, as modular components in vertical and/or horizontal recirculation wells, for treatment of volatile organic compounds (VOCs) [e.g., trichloroethene (TCE)] and radionuclides [e.g., technetium (Tc){sup 99}] in groundwater. The project was conceived, in part, because the coexistence of chlorinated hydrocarbons and radionuclides has been identified as the predominant combination of groundwater contamination in… more
Date: April 1, 1997
Creator: Korte, N. E.; Muck, M. T.; Zutman, J. L.; Schlosser, R. M.; Liang, L.; Gu, B. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A field trial of novel bifunctional resins for removing pertechnetate (TcO{sub 4}{sup {minus}}) from contaminated groundwater

Description: A field trial using a custom-designed bifunctional synthetic resin prepared at the University of Tennessee and designed to selectively remove pertechnetate (TcO{sub 4}{sup {minus}}) from groundwater was conducted in summer 1997 at the Northwest Plume Pump-and-Treat Facility at the US Department of Energy`s Paducah Gaseous Diffusion Plant (PGDP) site. The bifunctional resin, RO-02-119, was a copolymer of vinylbenzylchloride and divinylbenzene that had been functionalized with trihexylamine and t… more
Date: March 1, 1998
Creator: Gu, B.; Liang, L.; Brown, G. M.; Bonnesen, P. V.; Moyer, B. A.; Alexandratos, S. D. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

In situ vitrification demonstration at Pit 1, Oak Ridge National Laboratory. Volume 2: Site characterization report of the Pit 1 area

Description: A treatability study was initiated in October 1993, initially encompassing the application of in situ vitrification (ISV) to at least two segments of Oak Ridge National Laboratory (ORNL) seepage Pit 1 by the end of fiscal year (FY) 1995. This treatability study was to have supported a possible Interim Record of Decision (IROD) or removal action for closure of one or more of the seepage pits and trenches as early as FY 1997. The Remedial Investigation/Feasibility Study for Waste Area Grouping (W… more
Date: December 1, 1997
Creator: Spalding, B. P.; Bogle, M. A.; Cline, S. R.; Naney, M. T. & Gu, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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