Staff information
Odeta Qafoku
Geochemistry
Scientist
Pacific Northwest National Laboratory
PO Box 999
MSIN: K8-96
Richland, WA 99352
509/371-6383
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PNNL Publications
2013
- Arey BW, L Kovarik, O Qafoku, Z Wang, NJ Hess, and AR Felmy. 2013. "Identification of Fragile Microscopic Structures during Mineral Transformations in Wet Supercritical CO2." Microscopy and Microanalysis 19(2):268-275. doi:10.1017/S1431927612014171
- Rother G, ES Ilton, D Wallacher, T Hauss, HT Schaef, O Qafoku, KM Rosso, AR Felmy, E Krukowski, AG Stack, N Grimm, and RJ Bodnar. 2013. "CO2 Sorption to Subsingle Hydration Layer Montmorillonite Clay Studied by Excess Sorption and Neutron Diffraction Measurements." Environmental Science & Technology 47(1):205-211. doi:10.1021/es301382y
- Shao H, CJ Thompson, O Qafoku, and KJ Cantrell. 2013. "In Situ Spectrophotometric Determination of pH under Geologic CO2 Sequestration Conditions: Method Development and Application." Environmental Science & Technology 47(1):63-70. doi:10.1021/es3016793
2012
- Pearce CI, O Qafoku, J Liu, E Arenholz, SM Heald, RK Kukkadapu, CA Gorski, CMB Henderson, and KM Rosso. 2012. "Synthesis and properties of titanomagnetite (Fe3-xTixO4) nanoparticles: A tunable solid-state Fe(II/III) redox system." Journal of Colloid and Interface Science 387(1):24-38. doi:10.1016/j.jcis.2012.06.092
- Qafoku O, L Kovarik, RK Kukkadapu, ES Ilton, BW Arey, J Tucek, and AR Felmy. 2012. "Fayalite Dissolution and Siderite Formation in Water-Saturated Supercritical CO2." Chemical Geology 332-333:124-135. doi:10.1016/j.chemgeo.2012.09.028
- Amonette JE, PM Jeffers, O Qafoku, CK Russell, DR Humphrys, TW Wietsma, and MJ Truex. 2012. Abiotic degradation rates for carbon tetrachloride and chloroform: Final report. PNNL-22062; RPT-DVZ-AFRI-012, Pacific Northwest National Laboratory, Richland, WA.
- Felmy AR, DA Moore, CI Pearce, SD Conradson, O Qafoku, EC Buck, KM Rosso, and ES Ilton. 2012. "Controls on Soluble Pu Concentrations in PuO2/Magnetite Suspensions." Environmental Science & Technology 46(21):11610-11617. doi:10.1021/es3028956
- Felmy AR, O Qafoku, BW Arey, JZ Hu, MY Hu, HT Schaef, ES Ilton, NJ Hess, CI Pearce, J Feng, and KM Rosso. 2012. "Reaction of Water-Saturated Supercritical CO2 with Forsterite: Evidence for Magnesite Formation at Low Temperatures." Geochimica et Cosmochimica Acta 91:271-282. doi:10.1016/j.gca.2012.05.026
- Ilton ES, HT Schaef, O Qafoku, KM Rosso, and AR Felmy. 2012. "In Situ X-Ray Diffraction Study of Na+ Saturated Montmorillonite Exposed to Variably Wet Super Critical CO2." Environmental Science & Technology 46(7):4241-4248. doi:10.1021/es300234v
- Ilton ES, Z Wang, JF Boily, O Qafoku, KM Rosso, and SC Smith. 2012. "The Effect of pH and Time on the Extractability and Speciation of Uranium(VI) Sorbed to SiO2." Environmental Science & Technology 46(12):6604-6611. doi:10.1021/es300501v
- Liu J, CI Pearce, O Qafoku, E Arenholz, SM Heald, and KM Rosso. 2012. "Tc(VII) Reduction Kinetics by Titanomagnetite (Fe3-xTixO4) Nanoparticles." Geochimica et Cosmochimica Acta 92:67-81. doi:10.1016/j.gca.2012.06.004
- Loring JS, HT Schaef, RVF Turcu, CJ Thompson, QRS Miller, PF Martin, JZ Hu, DW Hoyt, O Qafoku, ES Ilton, AR Felmy, and KM Rosso. 2012. "In Situ Molecular Spectroscopic Evidence for CO2 Intercalation into Montmorillonite in Supercritical Carbon Dioxide." Langmuir 28(18):7125-7128. doi:10.1021/la301136w
- Schaef HT, ES Ilton, O Qafoku, PF Martin, AR Felmy, and KM Rosso. 2012. "In situ XRD Study of Ca2+ Saturated Montmorillonite (STX-1) Exposed to Anhydrous and Wet Supercritical Carbon Dioxide." International Journal of Greenhouse Gas Control 6(1):220-229. doi:10.1016/j.ijggc.2011.11.001
2011
- Felmy AR, DA Moore, KM Rosso, O Qafoku, D Rai, EC Buck, and ES Ilton. 2011. "Heterogeneous Reduction of PuO2 with Fe(II): Importance of the Fe(III) Reaction Product." Environmental Science & Technology 45(9):3952-3958.
2010
- Amonette JE, PM Jeffers, O Qafoku, CK Russell, DR Humphrys, TW Wietsma, and MJ Truex. 2010. Abiotic Degradation Rates for Carbon Tetrachloride and Chloroform: Progress in FY 2010. PNNL-20044, Pacific Northwest National Laboratory, Richland, WA.
- Amonette JE, PM Jeffers, O Qafoku, CK Russell, TW Wietsma, and MJ Truex. 2010. Abiotic Degradation Rates for Carbon Tetrachloride and Chloroform: Progress in FY2009 . PNNL-19142, Pacific Northwest National Laboratory, Richland, WA.
- Felmy AR, O Qafoku, BW Arey, and KD Boomer. 2010. Chemical Species in the Vapor Phase of Hanford Double-Shell Tanks: Potential Impacts on Waste Tank Corrosion Processes. PNNL-19767, Pacific Northwest National Laboratory, Richland, WA.
- Hixon AE, YJ Hu, DI Kaplan, RK Kukkadapu, H Nitsche, O Qafoku, and BA Powell. 2010. "Influence of Iron Redox Transformations on Plutonium Sorption to Sediments." Radiochimica Acta 98(9-11):685-692. doi:10.1524/ract.2010.1769
- Lumetta GJ, JC Braley, MK Edwards, O Qafoku, AR Felmy, JC Carter, and PJ MacFarlan. 2010. Removing Phosphate from Hanford High-Phosphate Tank Wastes: FY 2010 Results. PNNL-19778, Pacific Northwest National Laboratory, Richland, WA.
- Sullivan R, MJ Moore, MD Petters, SM Kreidenweis, O Qafoku, A Laskin, GC Roberts, and KA Prather. 2010. "Impact of Particle Generation Method on the Apparent Hygroscopicity of Insoluble Mineral Particles." Aerosol Science and Technology 44(10):830-846. doi:10.1080/02786826.2010.497514
2009
- Amonette JE, O Qafoku, TW Wietsma, PM Jeffers, CK Russell, and MJ Truex. 2009. Carbon Tetrachloride and Chloroform Attenuation Parameter Studies: Heterogeneous Hydrolytic Reactions -- Status Report. PNNL-18735, Pacific Northwest National Laboratory, Richland, WA.
2008
- Amonette JE, PM Jeffers, O Qafoku, CK Russell, TW Wietsma, and MJ Truex. 2008. Abiotic Degradation Rates for Carbon Tetrachloride: and Chloroform: Progress in FY 2008. PNNL-18020, Pacific Northwest National Laboratory, Richland, WA.
- Hess NJ, O Qafoku, Y Xia, DA Moore, and AR Felmy. 2008. "Thermodynamic Model for Solubility of TcO2·xH2O in Aqueous Oxalate System." Journal of Solution Chemistry 37(11):1471-1487. doi:10.1007/s10953-008-9328-5
2007
- Boily JF, O Qafoku, and AR Felmy. 2007. "A Potentiometric, Spectrophotometric and Pitzer Ion-Interaction Study of Reaction Equilibria in the Aqueous H+-Al3+, H+-Oxalate and H+-Al3+-Oxalate Systems up to 5 mol*dm-3 NaCl ." Journal of Solution Chemistry 36(11-12):1727-1743. doi:10.1007/s10953-007-9203-9
- Qafoku O, and AR Felmy. 2007. "Development of Accurate Chemical Equilibrium Models for Oxalate Species to High Ionic Strength in the System: Na-Ba-Ca-Mn-Sr-Cl-NO3-PO4-SO4-H2O at 25°C." Journal of Solution Chemistry 36(1):81-95.
- Qafoku N, O Qafoku, CC Ainsworth, A Dohnalkova, and SG McKinley. 2007. "Fe-Solid Phase Transformations Under Highly Basic Conditions." Applied Geochemistry 22(9):2054-2064. doi:10.1016/j.apgeochem.2007.04.023
2006
- Deng Y, M Flury, JB Harsh, AR Felmy, and O Qafoku. 2006. "Cancrinite and Sodalite Formation in the Presence of Cesium, Potassium, Magnesium, Calcium and Strontium in Hanford Tank Waste Simulants." Applied Geochemistry 21(12):2049-2063.
2005
- Felmy AR, MJ Mason, O Qafoku, and DA Dixon. 2005. "Development of Accurate Chemical Equilibrium Models for the Hanford Waste Tanks: The System Na-Ca-Sr-OH-CO3-NO3-EDTA-HEDTA-H2O from 25 to 75°C." In ACS Symposium Series, vol. 904, pp. 251-281. American Chemical Society, Washington, DC.
- Qafoku N, JM Zachara, C Liu, PL Gassman, O Qafoku, and SC Smith. 2005. "Kinetic Desorption and Sorption of U(VI) During Reactive Transport in a Contaminated Hanford Sediment." Environmental Science and Technology 39(9):3157-3165. doi:10.1021/es048462q
- Wang Z, AR Felmy, Y Xia, O Qafoku, W Yantasee, and HM Cho. 2005. "Complexation of Cm(III)/Eu(III) with Silicate in Basic Solutions." Radiochimica Acta 93(12):741-748.
- Wang Z, JM Zachara, PL Gassman, C Liu, O Qafoku, W Yantasee, and JG Catalano. 2005. "Fluorescence Spectroscopy of U(VI)-Silicates and U(VI)-Contaminated Hanford Sediment." Geochimica et Cosmochimica Acta 69(6):1391-1403. doi:10.1016/j.gca.2004.08.028
2004
- Felmy AR, and O Qafoku. 2004. "An Aqueous Thermodynamic Model for the Complexation of Nickel with EDTA Valid to high Base Concentration." Journal of Solution Chemistry 33(9):1161-1180. doi:10.1023/B:JOSL.0000048051.48779.0c
- Liu C, JM Zachara, O Qafoku, JP McKinley, SM Heald, and Z Wang. 2004. "Dissolution of Uranyl Microprecipitates from Subsurface Sediments at Hanford Site, USA." Geochimica et Cosmochimica Acta 68(22):4519-4537.
- Qafoku N, CC Ainsworth, JE Szecsody, and O Qafoku. 2004. "Transport-controlled kinetics of dissolution and precipitation in the sediments under alkaline and saline conditions ." Geochimica et Cosmochimica Acta 68(14):2981-2995.
- Zachara JM, CC Ainsworth, GE Brown, JR, JG Catalano, JP McKinley, O Qafoku, SC Smith, JE Szecsody, SJ Traina, and JA Warner. 2004. "Chromium Speciation and Mobility in a High Level Nuclear Waste Vadose Zone Plume." Geochimica et Cosmochimica Acta 68(1):13-30.
2003
- Felmy AR, MJ Mason, and O Qafoku. 2003. "An Aqueous Thermodynamic Model for the Complexation of Sodium and Strontium with Organic Chelators valid to High Ionic Strength. II. N-(2-hydroxyethyl)ethylenedinitrilotriacetic acid (HEDTA)." Journal of Solution Chemistry 32(4):301-318.
- Liu C, JM Zachara, O Qafoku, and SC Smith. 2003. "Effect of Temperature on Cs+ Sorption and Desorption in Subsurface Sediments at Hanford Site, U.S.A." Environmental Science and Technology 37(12):2640-2645.
- Qafoku N, CC Ainsworth, JE Szecsody, O Qafoku, and SM Heald. 2003. "Effect of Coupled Dissolution and Redox Reactions on Cr(VI)(aq) Attenuation during Transport in the Sediments under Hyperalkaline Conditions." Environmental Science and Technology 37(16):3640-3646.
- Qafoku N, CC Ainsworth, JE Szecsody, and O Qafoku. 2003. "Aluminum Effect on Dissolution and Precipitation under Hyperalkaline Conditions: I. Liquid Phase Transformations." Journal of Environmental Quality 32(6):2354-2369.
- Qafoku N, CC Ainsworth, JE Szecsody, DL Bish, JS Young, DE McCready, and O Qafoku. 2003. "Aluminum Effect on Dissolution and Precipitation under Hyperalkaline Conditions: II. solid Phase Transformations." Journal of Environmental Quality 32(6):2364-2372.