High-level radioactive tank waste solutions that have leaked into the subsurface at the US Department of Energy Hanford Site, Washington, are chemically complex. Here, the effect of five cations, Cs?, K?, Sr²?, Ca²? and Mg²?, on mineral formation and transformation pathways under conditions mimicking Hanford tank leaks is investigated. Sodium silicate was used to represent the dissolved silicate from sediments. The silicate was added into a series of simulants that contained 0.5 M aluminate, 1M or 16 M NaOH, and the NO?3 salts of the cations. The precipitates were monitored by X-ray diffraction, scanning electron microscopy, and X-ray energy dispersive spectroscopy. In the 1M NaOH simulants, low concentration of Cs? (
Revised: December 5, 2007 |
Published: December 1, 2006
Citation
Deng Y., M. Flury, J.B. Harsh, A.R. 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, no. 12:2049-2063.PNNL-SA-54132.