caesium selectivity coefficients ( k ( g ) ) that were determined with respect to na- , mg- , ca- , sr- and ba-ions , for kent and libby vermiculites , ranged from 4.8 to 11 ( litres/mol ) [ formula : see text ] , much higher than those with respect to k- and nh ( 4 ) -ions ( 0.01 to 0.06 ) , indicating the high affinity of vermiculite for the weakly hydrated cations .
C0022023
ions
C0007447
cations