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Calcite Precipitation and Trace Metal Partitioning in Groundwater and the Vadose Zone: Remediation of Strontium-90 and Other Divalent Metals and Radionuclides in Arid Western Environments

Description: Radionuclide and metal contaminants are present in the vadose zone and groundwater throughout the U.S. Department of Energy (DOE) weapons complex. Demonstrating in situ immobilization of these contaminants in vadose zones or groundwater plumes is a cost-effective remediation strategy. However, the implementation of in situ remediation requires definition of the mechanism that controls sequestration of the contaminants. One such mechanism for metals and radionuclides is co-precipitation of these… more
Date: July 19, 2000
Creator: Smith, Robert W.; Colwell, F. S.; Ingram, Jani C.; Ferris, F. Grant & Reysenbach, Anna-Louise
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

COULOMETRIC TITRATION OF URANIUM IN NITRIC ACID SOLUTIONS

Description: A coulometric titration method was developed for the determination of uranium in HNO/sub 3/ solutions. Uranium was reduced to the (IV) state and was titrated with electrolytically generated cerium(IV). The colorimetric end point was detected automatically by a photometric technique. Interference from nitrate was eliminated by the addition of urea to the titration medium. The coefficient of variation for the analysis of uranium was 3.2% for 1-mg samples and 0.3% for 100-mg samples. With the addi… more
Date: July 1, 1960
Creator: Fulda, M.O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Impact of Soil Sampling Errors on Variable Rate Fertilization

Description: Variable rate fertilization of an agricultural field is done taking into account spatial variability in the soil’s characteristics. Most often, spatial variability in the soil’s fertility is the primary characteristic used to determine the differences in fertilizers applied from one point to the next. For several years the Idaho National Engineering and Environmental Laboratory (INEEL) has been developing a Decision Support System for Agriculture (DSS4Ag) to determine the economically optimum r… more
Date: July 1, 2004
Creator: Hoskinson, R. L.; Rope, R C.; Blackwood, L G.; Lee, R D. & Fink, R K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Synthetic Multivariate Models to Accommodate Unmodeled Interfering Components During Quantitative Spectral Analyses

Description: The analysis precision of any multivariate calibration method will be severely degraded if unmodeled sources of spectral variation are present in the unknown sample spectra. This paper describes a synthetic method for correcting for the errors generated by the presence of unmodeled components or other sources of unmodeled spectral variation. If the spectral shape of the unmodeled component can be obtained and mathematically added to the original calibration spectra, then a new synthetic multiva… more
Date: July 14, 1999
Creator: Haaland, David M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Transuranic contaminated waste form characterization and data base

Description: This volume contains appendices A to F. The properties of transuranium (TRU) radionuclides are described. Immobilization of TRU wastes by bituminization, urea-formaldehyde polymers, and cements is discussed. Research programs at DOE facilities engaged in TRU waste characterization and management studies are described.
Date: July 1, 1980
Creator: Kniazewycz, B. G. & McArthur, W. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Charge Separation in Photoredox Reactions. Final Report

Description: The structural aspects controlling charge separation in molecular photoionization reactions in organized molecular assemblies involving micelles, reverse micelles and vesicles are being studied by optical and electron magnetic resonance techniques including the time domain technique of deuterium electron spin echo modulation (ESEM) and matrix proton electron nuclear double resonance (ENDOR) to measure weak electron-nuclear dipolar interactions. ESEM and matrix ENDOR are particularly well adapte… more
Date: July 15, 1993
Creator: Kevan, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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