title: Application of DGT to high pH environments: uptake efficiency of radionuclides of different oxidation states onto Chelex binding gel.
abstract: The DGT Chelex binding phase has not been tested for binding efficiency over the extreme high pH range (i.e., 10 to 13). Here, we examined the uptake efficiency of the gel-encapsulated Chelex cation exchange resin binding phase when in direct contact with solutions of radionuclides of different oxidation states over the circumneutral to high pH range (∼7 to 13). Results show that the Chelex binding gel is suitable for Eu(3+) for circumneutral pH, for UO2(2+) up to at least pH 10.7 and for NpO2(+) up to at least pH 11.7. Application may be appropriate at higher pH values but testing of complete solution deployment units will be required. This work provides the framework to use DGT as a tool for the study of high pH radionuclide systems.
authors.affiliation: Centre for Radiochemistry Research, School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK. tony@biogeochemistry.org.uk
authors.forename: Anthony
authors.initials: A
authors.lastname: Stockdale
authors.forename: Nick D
authors.initials: ND
authors.lastname: Bryan
mesh_terms: D002614:Chelating Agents / Q000737:chemistry; D004058:Diffusion; D004784:Environmental Monitoring; D005782:Gels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007475:Ion Exchange Resins / Q000737:chemistry*; D009405:Neptunium / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D010087:Oxides / Q000302:isolation & purification*; D011137:Polystyrenes / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D011868:Radioisotopes / Q000302:isolation & purification*; D017974:Uranium Compounds / Q000302:isolation & purification*
chemical_list: D002614:Chelating Agents; D005782:Gels; D007475:Ion Exchange Resins; D010087:Oxides; D011137:Polystyrenes; D011145:Polyvinyls; D011868:Radioisotopes; D017974:Uranium Compounds; D009405:Neptunium; C006960:chelex; C012597:uranium dioxide