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Stable Isotopic Investigations of In-Situ Bioremediation of Chlorinated Organic Solvents

Description: The research objectives of this program are threefold: to develop methods for measuring stable isotope ratios of carbon and chlorine in chlorinated aliphatic hydrocarbons (CAHs); to apply these methods to experimental determinations of kinetic and equilibrium isotope effects during biological, chemical, and physical transformation of CAHs; and to apply these methods to CAHs extracted from ground water at well characterized, contaminated aquifer sites. The overall objective is to develop an unde… more
Date: June 1, 2000
Creator: Sturchio, Neil C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reactivity of Primary Soil Minerals and Secondary Precipitates Beneath Leaking Hanford Waste Tanks

Description: This project, renewal of a previous EMSP project of the same title, is in its first year of funding at the University of Illinois at Chicago. The purpose is to continue investigating rates and mechanisms of reactions between primary sediment minerals found in the Hanford subsurface and leaked waste tank solutions. The goals are to understand processes that result in (1) changes in porosity and permeability of the sediment and resultant changes in flow paths of the contaminant plumes, (2) format… more
Date: June 1, 2003
Creator: Nagy, Kathryn L. & Sturchio, Neil C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Kinetic Isotopic Fractionation During Diffusion of Ionic Speciesin Water

Description: Experiments specifically designed to measure the ratio of the diffusivities of ions dissolved in water were used to determine D{sub Li}/D{sub K}, D{sub 7{sub Li}}/D{sub 6{sub Li}}, D{sub 25{sub Mg}}/D{sub 24{sub Mg}}, D{sub 26{sub Mg}}/D{sub 25{sub Mg}}, and D{sub 37{sub Cl}}/D{sub 35{sub Cl}}. The measured ratio of the diffusion coefficients for Li and K in water (D{sub Li}/D{sub K} = 0.6) is in good agreement with published data, providing evidence that the experimental design being used reso… more
Date: June 9, 2005
Creator: Richter, Frank M.; Mendybaev, Ruslan A.; Christensen, John; Hutcheon, Ian D.; Williams, Ross W.; Sturchio, Neil C. et al.
Item Type: Refine your search to only Article
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

The impact of biogenic carbon emissions on aerosol absorption inMexico City

Description: In order to determine the wavelength dependence of atmospheric aerosol absorption in the Mexico City area, the absorption angstrom exponents (AAEs) were calculated from aerosol absorption measurements at seven wavelengths obtained with a seven-channel aethalometer during two field campaigns, the Mexico City Metropolitan Area study in April 2003 (MCMA 2003) and the Megacity Initiative: Local and Global Research Observations in March 2006 (MILAGRO). The AAEs varied from 0.76 to 1.56 in 2003 and f… more
Date: February 24, 2009
Creator: Marley, Nancy A.; Gaffney, Jeffrey S.; Tackett, Michael J.; Sturchio, Neil C.; Hearty, Linnea; Martinez, Nancy et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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