Date of Award
Master of Science (MS)
Environmental Engineering and Science
Characterization of the IBC Advanced Technologies SuperLig¨ 620 solid phase extraction resin was performed in order to develop an automated strontium-90 process monitor. The main focus was on strontium separation from barium, with the goal of developing an automated separation process for strontium-90 in Hanford high-level tank wastes. High-level waste tanks contain significant cesium-137 activities, of which barium daughters are of great concern as interferences to strontium quantification. A number of complexants were studied in a series of batch distribution coefficient experiments, as SuperLig¨ 620 was not previously known to elute strontium in typical mineral acids. The optimal separation was found using a 2M nitric acid load solution with a strontium elution step of ~0.49M ammonium citrate and a barium elution step of ~1.8M ammonium citrate. Strontium quantification in Hanford AN-105 tank simulant was performed on a sequential injection analysis microfluidics system with a glass scintillation flow-cell detector.
Clements, John, "Characterization of the IBC Technologies SuperLig¨ 620 Solid Phase Extraction Resin With Applications for Automated Process Monitoring" (2007). All Theses. 68.