co-ions

https://doi.org/10.1351/goldbook.C01141
  1. Ions
    of low
    relative molecular mass
    with a charge of the same sign as that of a given
    colloidal
    ion.
    Source:
    PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 607 [Terms] [Paper]
  2. In an
    ion exchanger
    , mobile ionic species with a charge of the same sign as the
    fixed ions
    .
    Source:
    Orange Book, 2nd ed., p. 88 [Terms] [Book]