title: Analysis of pH dependent uranium(VI) sorption to nanoparticulate hematite by flow field-flow fractionation-inductively coupled plasma mass spectrometry.
abstract: The ability to quantify the amount of metals ions that are present as macromolecular, nanoparticulate, or colloid phases is critical for understanding bioavailability and transport as well as performing risk assessments and remediation strategies. Flow field-flow fractionation-inductively coupled plasma mass spectrometry (FI FFF-ICP-MS) is a powerful separation tool that has been previously used to characterize colloidal metals in environmental samples. In this study we examine the degree to which FI FFF-ICP-MS provides quantitative data on uranium speciation by comparing the results to centrifugation followed by filtration. Sorption of uranium to nanoparticulate hematite (approximately 60 nm) was examined over the pH range of 3 to 6. Close agreement was found between the two approaches over the pH range.
authors.affiliation: Environmental Science and Engineering Division, Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, USA.
authors.forename: Emily K
authors.initials: EK
authors.lastname: Lesher
authors.forename: James F
authors.initials: JF
authors.lastname: Ranville
authors.forename: Bruce D
authors.initials: BD
authors.lastname: Honeyman
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D031521:Fractionation, Field Flow / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D013058:Mass Spectrometry / Q000379:methods*; D053758:Nanoparticles; D012680:Sensitivity and Specificity; D014501:Uranium / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide; D014501:Uranium