CE-ICP-MS Investigation of the Carbonate Complexation of Am(III), Th(IV), Np(V), and U(VI) and the Influence of Alkali Cations.

ABSTRACT: Capillary electrophoresis inductively coupled plasma mass spectrometry (CE-ICP-MS) was used to investigate the carbonate complexation of Am(III), Th(IV), Np(V), and U(VI) at environmentally relevant concentrations. Experiments were conducted at an ionic strength of 0.33 M in different alkali chloride solutions (Li⁺, Na⁺, and K⁺). Formation constants for the three successive actinide carbonate complexes were determined for Am(III), Np(V), and U(VI). For Th(IV), the CE-ICP-MS measurements posed some challenges. The complexation of U(VI) with carbonate was determined to be stronger than previously assumed. A strong influence of alkali cations on the electrophoretic mobility μ of highly negatively charged actinide carbonate complexes was observed and attributed

SUBMITTER: Lohmann J 

PROVIDER: S-EPMC12570134 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature