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Citric Acid-Modified Fenton's Reaction for the Oxidation of Chlorinated Ethylenes in Soil Solution Systems

Description: Fenton's reagent, a solution of hydrogen peroxide and ferrous iron catalyst, is used for an in-situ chemical oxidation of organic contaminants. Sulfuric acid is commonly used to create an acidic condition needed for catalytic oxidation. Fenton's reaction often involves pressure buildup and precipitation of reaction products, which can cause safety hazards and diminish efficiency. We selected citric acid, a food-grade substance, as an acidifying agent to evaluate its efficiencies for organic con… more
Date: March 15, 2008
Creator: Seol, Yongkoo & Javandel, Iraj
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Reactive Distillation for Esterification of Bio-based Organic Acids

Description: The following is the final report of the three year research program to convert organic acids to their ethyl esters using reactive distillation. This report details the complete technical activities of research completed at Michigan State University for the period of October 1, 2003 to September 30, 2006, covering both reactive distillation research and development and the underlying thermodynamic and kinetic data required for successful and rigorous design of reactive distillation esterificati… more
Date: September 23, 2008
Creator: Fields, Nathan; Miller, Dennis J.; Asthana, Navinchandra S.; Kolah, Aspi K.; Vu, Dung & Lira, Carl T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Genome of the Epsilonproteobacterial Chemolithoautotroph Sulfurimonas dentrificans

Description: Sulfur-oxidizing epsilonproteobacteria are common in a variety of sulfidogenic environments. These autotrophic and mixotrophic sulfur-oxidizing bacteria are believed to contribute substantially to the oxidative portion of the global sulfur cycle. In order to better understand the ecology and roles of sulfur-oxidizing epsilonproteobacteria, in particular those of the widespread genus Sulfurimonas, in biogeochemical cycles, the genome of Sulfurimonas denitrificans DSM1251 was sequenced. This geno… more
Date: August 8, 2007
Creator: Class, USF Genomics; Sievert, Stefan M.; Scott, Kathleen M.; Klotz, Martin G.; Chain, Patrick S.G.; Hauser, Loren J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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PH Sensitive Polymers for Improving Reservoir Sweep and Conformance Control in Chemical Flooring

Description: There is an increasing opportunity to recover bypassed oil from depleted, mature oilfields in the US. The recovery factor in many reservoirs is low due to inefficient displacement of the oil by injected fluids (typically water). The use of chemical flooding methods to increase recovery efficiencies is severely constrained by the inability of the injected chemicals to contact the bypassed oil. Low sweep efficiencies are the primary cause of low oil recoveries observed in the field in chemical fl… more
Date: March 31, 2008
Creator: Sharma, Mukul; Bryant, Steven & Huh, Chun
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Monitoring/Verification using DMS: TATP Example

Description: Field-rugged and field-programmable differential mobility spectrometry (DMS) networks provide highly selective, universal monitoring of vapors and aerosols at detectable levels from persons or areas involved with illicit chemical/biological/explosives (CBE) production. CBE sensor motes used in conjunction with automated fast gas chromatography with DMS detection (GC/DMS) verification instrumentation integrated into situational operations management systems can be readily deployed and optimized … more
Date: March 1, 2008
Creator: Weeks, Stephan & Kyle, Kevin
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Foot & Mouth Disease & Ulcerative/Vesicular Rule-outs: Challenges Encountered in Recent Outbreaks

Description: Foot and mouth disease (FMD) is a highly infectious and contagious viral disease affecting bovidae (cattle, zebus, domestic buffaloes, yaks), sheep, goats, swine, all wild ruminants and suidae. Camelidae (camels, dromedaries, llamas, vicunas) have low susceptibility. Foot and mouth disease is caused by a RNS virus of the family Picornaviridae, genus Aphthovirus. There are seven immunologically distinct serotypes: A, O, C, SAT1, SAT2, SAT3, Asia 1. Foot and mouth disease causes significant econo… more
Date: January 28, 2008
Creator: Hullinger, P
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Bio-/Photo-Chemical Separation and Recovery of Uranium

Description: Citric acid forms bidentate, tridentate, binuclear or polynuclear species with transition metals and actinides. Biodegradation of metal citrate complexes is influenced by the type of complex formed with metal ions. While bidentate complexes are readily biodegraded, tridentate, binuclear and polynuclear species are recalcitrant. Likewise certain transition metals and actinides are photochemically active in the presence of organic acids. Although the uranyl citrate complex is not biodegraded, in … more
Date: March 12, 2008
Creator: Francis, A. J. & Dodge, C. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Technetium Behavior and Recovery in Soil

Description: Technetium-99 in soils is of great concern because of its long half-life and because it can not be detected readily. This work reviews the behavior of technetium in various types of soils. A method for extracting technetium from soil was developed with the use of technetium-95m and 99m to determine recoveries at each step. Technetium chemistry is very complicated and problem areas in the behavior and recovery have been highlighted. Technetium is widely used in nuclear medicine and a review of i… more
Date: December 1, 1995
Creator: Meinken, G. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effects of Hanford high-level waste components on sorption of cobalt, strontium, neptunium, plutonium, and americium on Hanford sediments

Description: To judge the feasibility of continued storage of high-level waste solutions in existing tanks, effects of chemical waste components on the sorption of hazardous radioelements were determined. Experiments identified the effects of 12 Hanford high-level waste-solution components on the sorption of cobalt, strontium, neptunium, plutonium, and americium on 3 Hanford 200 Area sediments. The degree of sorption of strontium, neptunium, plutonium, and americium on two Hanford sediments was then quantif… more
Date: March 1, 1983
Creator: Delegard, C H & Barney, G S
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization of uranium contaminated soils from DOE Fernald Environmental Management Project Site: Results of Phase 1 characterization

Description: The Integrated Demonstration (ID) for remediation of uranium- contaminated soils has been established by the DOE Office of Technology Development. The Fernald (Feed Materials Production Center) site was selected as the DOE facility for the field demonstration. The principle objective of this ID is to evaluate and compare the versatility, efficiency, and economics of various technologies that may be combined into systems for the removal of uranium from contaminated soils. Several leaching soluti… more
Date: January 1, 1992
Creator: Lee, S. Y. & Marsh, J. D. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chemical cleaning specification: few tube test model

Description: The specification is for the waterside chemical cleaning of the 2 1/4 Cr - 1 Mo steel steam generator tubes. It describes the reagents and conditions for post-chemical cleaning passivation of the evaporator tubes. (DLC)
Date: September 1, 1979
Creator: Hampton, L. V. & Simpson, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Dilute chemical decontamination program. Quarterly report 3, April 1-June 30, 1978. Report NEDC-12705-3

Description: The by-products generated by the radiolytic decomposition of oxalic acid, ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), citric acid, and ascorbic acid were determined by exposing 0.01 M solutions of the metal-ion-free acids to a dose of 4 x 10/sup 7/ rad at 90/sup 0/C with an inert gas atmosphere. The radiolytic decomposition rates of oxalic acid, NTA, and EDTA were investigated. The dissolution rates of unirradiated UO/sub 2/ pellets in 0.01 M solutions of oxalic acid, E… more
Date: November 1, 1978
Creator: Anstine, L.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Biotechnology for Producing Fuels and Chemicals From Biomass. Volume 2. Fermentation Chemicals From Biomass

Description: The technological and economic feasibility of producing some selected chemicals by fermentation is discussed: acetone, butanol, acetic acid, citric acid, 2,3-butanediol, and propionic acid. The demand for acetone and butanol has grown considerably. They have not been produced fermentatively for three decades, but instead by the oxo and aldol processes. Improved cost of fermentative production will hinge on improving yields and using cellulosic feedstocks. The market for acetic acid is likely to… more
Date: February 1, 1981
Creator: Villet, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Isocitrate lyase and the glyoxylate cycle. Progress report, February 16, 1992--February 15, 1993

Description: This progress report describes efforts directed at the active-site modification of isocitrate lyase (icl) of Escherichia coli. Studies are reported that describe the results of several amino acid substitutions gained by directed mutagenesis of the icl gene. Preliminary studies are also related in cloning, sequencing and expression of icl of watermelon.
Date: December 31, 1992
Creator: McFadden, B. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Selective leaching of uranium from uranium-contaminated soils: Progress report 1

Description: Three soils and a sediment contaminated with uranium were used to determine the effectiveness of sodium carbonate and citric acid leaching to decontaminated or remove uranium to acceptable regulatory levels. Two of the soils were surface soils from the DOE facility formerly called the Feed Materials Production Center (FMPC) at Fernald, Ohio. This facility is presently called the Femald Environmental Management Project (FEMP). Carbonate extractions generally removed from 70 to 90% of the uranium… more
Date: February 1, 1993
Creator: Francis, C. W.; Mattus, A. J.; Farr, L. L.; Elless, M. P. & Lee, S. Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization of uranium contaminated soils from DOE Fernald Environmental Management Project Site: Results of Phase 1 characterization

Description: The Integrated Demonstration (ID) for remediation of uranium- contaminated soils has been established by the DOE Office of Technology Development. The Fernald (Feed Materials Production Center) site was selected as the DOE facility for the field demonstration. The principle objective of this ID is to evaluate and compare the versatility, efficiency, and economics of various technologies that may be combined into systems for the removal of uranium from contaminated soils. Several leaching soluti… more
Date: January 1, 1992
Creator: Lee, S. Y. & Marsh, J. D. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pilot-scale decontamination solution test results HGTP-93-0702-02

Description: Decontamination solution testing constitutes a task of the Hanford Grout Technology Program (HGTP) at Pacific Northwest Laboratory (PNL). The HGTP provides technical support to the Westinghouse Hanford Company (WHC) Grout Disposal Program. Cementitious grout has been identified as the waste form for low-level radioactive waste. Grout processing equipment, including mixers, pumps, and piping, will require periodic maintenance. Decontamination of components is needed to reduce radiation dose to m… more
Date: May 1, 1993
Creator: Clemmer, R. G.; Allen, R. P.; Bagaasen, L. M. & Fetrow, L. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effects of citric acid demineralization on heats of immersion of Wyodak and Illinois No. 6 coals in strong acids. Tenth quarterly report

Description: An important component of our last report was the discovery that demineralization of Argonne Wyodak coal by citric acid washing had changed the heats of immersion of this coal in seven strong acids very significantly. The results were so dramatic that the whole series of experiments with this demineralized coal was repeated and confirmed. Several of the {Delta}H{sub imm}s were reduced as much as 30% while those with arylsulfonic acids actually increased. The mineral content of coals can be as h… more
Date: September 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CITRIC ACID AS A SET RETARDER FOR CALCIUM ALUMINATE PHOSPHATE CEMENTS.

Description: Citric acid added as set retarder significantly contributed to enhancing the setting temperature and to extending the thickening time of a calcium aluminate phosphate (CaP) geothermal cement slurry consisting of calcium aluminate cement (CAC) as the base reactant and sodium polyphosphate (NaP) solution as the acid reactant. The set-retarding activity of citric acid was due to the uptake of Ca{sup 2+} ions from the CAC by carboxylic acid groups within the citric acid. This uptake led to the prec… more
Date: January 1, 2005
Creator: SUGAMA,T. & BROTHERS, L. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparative genomics of citric-acid producing Aspergillus niger ATCC 1015 versus enzyme-producing CBS 513.88

Description: The filamentous fungus Aspergillus niger exhibits great diversity in its phenotype. It is found globally, both as marine and terrestrial strains, produces both organic acids and hydrolytic enzymes in high amounts, and some isolates exhibit pathogenicity. Although the genome of an industrial enzyme-producing A. niger strain (CBS 513.88) has already been sequenced, the versatility and diversity of this species compels additional exploration. We therefore undertook whole genome sequencing of the a… more
Date: April 28, 2011
Creator: Grigoriev, Igor V.; Baker, Scott E.; Andersen, Mikael R.; Salazar, Margarita P.; Schaap, Peter J.; Vondervoot, Peter J.I. van de et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of citric acid demineralization on heats of immersion of Wyodak and Illinois No. 6 coals in strong acids

Description: An important component of our last report was the discovery that demineralization of Argonne Wyodak coal by citric acid washing had changed the heats of immersion of this coal in seven strong acids very significantly. The results were so dramatic that the whole series of experiments with this demineralized coal was repeated and confirmed. Several of the {Delta}H{sub imm}s were reduced as much as 30% while those with arylsulfonic acids actually increased. The mineral content of coals can be as h… more
Date: January 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

AN INVESTIGATION OF THE ISOTOPES OF AMERICIUM AND CURIUM

Description: Isotopes of americium and curium with mass numbers less than 242 have been produced by cyclotron bombardment techniques, and several of their nuclear properties have been investigated. The partial alpha half-lives of Am{sup 239}, Cm{sup 241}, and Cm{sup 240} and the partial half-life for spontaneous fission of Cm{sup 240} were measured. The alpha decay daughter of Cm{sup 238} was found and evidence for the discovery of Am{sup 237} (an {approx}1 hour electron capture activity) and Cm{sup 239} (a… more
Date: June 1, 1952
Creator: Higgins, Gary Hoyt.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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