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in subjects: "Oxalates"

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Effect of organic complexants on the mobility of nickel and cobalt in soils. Status report

A study is being conducted of the effect of organic complexing agents on the behavior of low-level waste radionuclides in soil/groundwater systems. This report contains the results of recent work with Ni and Co, two elements that have radioactive isotopes that are important to low-level waste disposal. The complexants studied were EDTA, DTPA, oxalate, and citrate. Data were obtained from experiments using soils from both an arid site (Hanford, Washington) and a humid site (Savannah River, South… more

Date: September 1, 1982

Creator: Swanson, J.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Laboratory-scale evaluations of alternative plutonium precipitation methods

Plutonium(III), (IV), and (VI) carbonate; plutonium(III) fluoride; plutonium(III) and (IV) oxalate; and plutonium(IV) and (VI) hydroxide precipitation methods were evaluated for conversion of plutonium nitrate anion-exchange eluate to a solid, and compared with the current plutonium peroxide precipitation method used at Rocky Flats. Plutonium(III) and (IV) oxalate, plutonium(III) fluoride, and plutonium(IV) hydroxide precipitations were the most effective of the alternative conversion methods t… more

Date: February 8, 1984

Creator: Martella, L. L.; Saba, M. T. & Campbell, G. K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A visible/near-ir spectral database for plutonium solutions of known nitric acid, fluoride, and oxalate composition

Fluoride and oxalate are common components of plutonium process solutions. Unfortunately, these anions form highly stable complexes that interfere in many plutonium process operations. Knowledge of the fluoride and oxalate content of process solutions may allow appropriate corrective action to be taken to prevent such interference. On-line spectrophotometry, which is being developed to monitor process solutions at the Los Alamos Plutonium Facility, has the potential to detect and estimate the c… more

Date: April 1, 1989

Creator: Day, R.S.; Vigil, A.R. & Marsh, S.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Precipitation of plutonium(IV) oxalate in Task I

Laboratory experience on the precipitation of Pu(IV) oxalate is summarized. Filterable Pu(IV) oxalate with a cake density of 0.6 to 0.7 g Pu/cm/sup 3/ cake was precipitated from Redox PR solutions containing 10 to 200 g/l Pu and 2 to 6 M HNO/sub 3/. Filtration ease increased with strike temperature from 35 to 60/sup 0/C. Optimum conditions for pre-reduction of Pu(VI) to (IV), precipitation, digestion, filtration and washing were determined for 60 g/l Pu. Separation factors of 80, 40, 20, and 12… more

Date: April 1, 1953

Creator: Harmon, K. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Dynamic process model of a plutonium oxalate precipitator. Final report

In support of LLL material safeguards program, a dynamic process model was developed which simulates the performance of a plutonium (IV) oxalate precipitator. The plutonium oxalate precipitator is a component in the plutonium oxalate process for making plutonium oxide powder from plutonium nitrate. The model is based on state-of-the-art crystallization descriptive equations, the parameters of which are quantified through the use of batch experimental data. The dynamic model predicts performance… more

Date: November 1, 1977

Creator: Miller, Charles L.; Hammelman, James E. & Borgonovi, Giancarlo M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Effect of organic complexants on the mobility of low-level-waste radionuclides in soils

The effect of certain organic complexants on the distribution of some radionuclides between solution and soil has been measured. The complexants and radionuclides examined are some of those most likely to be present in low-level waste disposal sites; Cs, Sr, Ni, Co, and Eu radionuclides, and EDTA, DTPA, oxalate, and citrate complexants. The effect of complexants was found to vary widely; in some systems there was no effect and in other systems there were large effects. In some cases slow rates … more

Date: February 1, 1982

Creator: Swanson, J.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Direct speciation of metal and metalloid ions by optical spectroscopies

Molecular level spectroscopic investigations of organic/inorganic interactions provide important new information on sedimentary geochemistry through the identification of interactions over moderate temperature and pH ranges. Although the official title of this project indicates the use of only optical spectroscopies, a combination of Uv/Vis/IR absorption, Raman scattering, and {sup 29}Si and {sup 13}C nuclear magnetic resonance (NMR) experiments are actually employed. A major advantage of integ… more

Date: January 1, 1991

Creator: Tait, C. D.; Janecky, D. R.; Clark, D. L.; Ekberg, S. A.; Dixon, P. R.; Musgrave, J. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recovery of americium-241 from aged plutonium metal

After separation and purification, both actinides were precipitated as oxalates and calcined. A large-scale process was developed using dissolution, separation, purification, precipitation, and calcination. Efforts were made to control corrosion, to avoid product contamination, to keep the volume of process and waste solutions manageable, and to denitrate solutions with formic acid. The Multipurpose Processing Facility (MPPF), designed for recovery of transplutonium isotopes, was used for the f… more

Date: January 1, 1980

Creator: Gray, L W; Burney, G A; Reilly, T A; Wilson, T W & McKibben, J M

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Direct fabrication of /sup 238/PuO/sub 2/ fuel forms

The current process for the fabrication of /sup 238/PuO/sub 2/ heat sources includes precipitation of small particle plutonium oxalate crystals (4 to 6 ..mu..m diameter), a calcination to PuO/sub 2/, ball milling, cold pressing, granulation (60 to 125 ..mu..m), and granule sintering prior to hot pressing the fuel pellet. A new two-step direct-strike Pu(III) oxalate precipitation method which yields mainly large well-developed rosettes (50 to 100 ..mu..m diameter) has been demonstrated in the la… more

Date: July 1, 1982

Creator: Burney, G. A. & Congdon, J. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Low temperature hydrothermal processing of organic contaminants in Hanford tank waste

Batch and continuous flow reactor tests at Pacific Northwest Laboratory (PNL) have shown that organics similar to those present in the single-shell and double-shell underground storage tanks at Hanford can be decomposed in the liquid phase at relatively mild temperatures of 150[degree]C to 350[degree]C in an aqueous process known as hydrothermal processing (HTP). The organics will react with the abundant oxidants such s nitrite already present in the Hanford tank waste to form hydrogen, carbon … more

Date: February 1, 1993

Creator: Jones, E. O.; Pederson, L. R.; Freeman, H. D.; Schmidt, A. J. & Babad, H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mound Laboratory activities in chemical and physical research: January--June 1977

Activities are reported in research programs on computer operations, isotope separation, low temperature phenomena, metal hydrides, separation chemistry, and separation methods. (JRD)

Date: October 4, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department