Kinetics of Na- and K- uranyl arsenate dissolution.

ABSTRACT: We integrated aqueous chemistry analyses with geochemical modeling to determine the kinetics of the dissolution of Na and K uranyl arsenate solids (UAs_(s)) at acidic pH. Improving our understanding of how UAs_(s) dissolve is essential to predict transport of U and As, such as in acid mine drainage. At pH 2, Na_0.48H_0.52(UO₂)(AsO₄)(H₂O)_2.5(s) (NaUAs_(s)) and K_0.9H_0.1(UO₂)(AsO₄)(H₂O)_2.5(s) (KUAs_(s)) both dissolve with a rate constant of 3.2 × 10^-7 mol m^-2 s^-1, which is faster than analogous uranyl phosphate solids. At pH 3, NaUAs_(s) (6.3 × 10^-8 mol m^-2 s

SUBMITTER: Meza I 

PROVIDER: S-EPMC10434837 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature