Measured solubilities and speciations of neptunium, plutonium, and americium in a typical groundwater (J-13) from the Yucca Mountain region; Milestone report 3010-WBS 1.2.3.4.1.3.1 Page: 2 of 43
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TABLE OF CONTENTS
action EM
LIST OF FIGURES............................................................... vii
LIST OF TABLES................................................................ xi
1. EXECUTIVE SUMMARY..................................................... 1
2. PURPOSE AND OBJECTIVE .................................................. 5
3. CONCEPT OF SOLUBILITY STUDIES.................................... 7
3.1. Oversaturation and Undersaturation...................................... 8
3.2. Phase Separation........................................................... 9
3.3. Solid Phase .................................................................. 10
3.4. Determination of Oxidation States and Speciation ..................... 11
4. EXPERIMENTAL DETAILS................................................... 13
4.1. Controlled Atmosphere Glove Box....................................... 13
4.2. Control System for pH and Temperature ............................... 15
4.3. Pressure Control System.................................................. 15
4.4. Solutions..................................................................... 15
4.5. Phase Separation........................................................... 19
4.6. Analysis..................................................................... 20
4.7. Criteria for Steady-State Concentrations ................................. 20
4.8. Eh Measurements ........................................................... 21
4.9. Identification of Solids .................................................... 21
5. RESULTS AND DISCUSSION ................................................ 22
5.1. Neptunium.................................................................. 22
5.1.1. Solubility.......................................................... 22
5.1.2. Speciation.......................................................... 22
5.1.3. Identification of Solids ........................................... 32
5.2. Plutonium .................................................................... 51
5.2.1. Solubility.......................................................... 51
5.2.2. Oxidation State Determination................................... 51
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Nitsche, H.; Gatti, R.C. & Standifer, E.M. Measured solubilities and speciations of neptunium, plutonium, and americium in a typical groundwater (J-13) from the Yucca Mountain region; Milestone report 3010-WBS 1.2.3.4.1.3.1, report, July 1, 1993; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc628468/m1/2/: accessed April 20, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.