Effect of denaturants on the speciation of uranium(VI) complexes of malonic acid in micellar media

A computer assisted investigation has been made on the nature of complexes of uranium(VI) with malonic acid. ne formation constants have been determin ed experimentally by monitoring hydrogen ion concentration. ne distribution of the metal ion amongst the complexes formed with the above carboxylic ac id has also been computed. The formation constants have been refined with t he computer program, MINIQUAD75 using the primary alkalimetric data. The pr edominant complexes formed are [UO2(H2C3O4)(2)](2-), UO2(H2C3O4) and [UO2(H 2C3O4)(H2C3O4H)](-). The distribution pattern of different species varies w ith the relative concentrations of the metal ion and the ligand. The variat ion of stability with surfactant concentrations is found to be the cumulati ve effect of various factors like electrostatic interactions, dilution effe ct and competition for hydrogen ion associated with the nature of micelles.