title: The effect of EDTA, NTA and picolinic acid on Th(IV) mobility in a ternary system with natural sand.
abstract: Organic complexing agents, such as ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA) and picolinic acid, have been widely used at nuclear sites and are therefore found as common co-contaminants in radioactive contaminated land. This study has explored the mechanisms by which these three complexing agents affect the sorption of Th(IV) to pure silica and a natural sand. EDTA, NTA and, to a lesser extent, picolinic acid decreased the sorption of Th to silica, demonstrating the formation and solubility of Th complexes. However, Th sorption to sand was kinetically controlled and complexation enhanced the rate of Th sorption. EDTA and NTA did not sorb significantly to the sand, and metal desorption indicated that the mechanism involved exchange with sand-associated metals. At equilibrium, however, Th sorption was not affected by the presence of the ligands, and modelling suggested that the interaction between Th and the surface binding sites controlled Th sorption thermodynamically.
authors.affiliation: Biogeochemistry Research Centre, University of Plymouth, Plymouth, UK. estela.reinoso-maset@cea.fr
authors.forename: Estela
authors.initials: E
authors.lastname: Reinoso-Maset
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Worsfold
authors.forename: Miranda J
authors.initials: MJ
authors.lastname: Keith-Roach
mesh_terms: D000327:Adsorption; D002614:Chelating Agents / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry*; D009571:Nitrilotriacetic Acid / Q000737:chemistry*; D010848:Picolinic Acids / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry*; D013910:Thorium / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D010848:Picolinic Acids; D012987:Soil; D012989:Soil Pollutants; D013910:Thorium; D012822:Silicon Dioxide; D004492:Edetic Acid; D009571:Nitrilotriacetic Acid; C030614:picolinic acid