the duct showed negligible selectivity between the monovalent cations li : na : k : rb : cs = 1.08:1.10:1.09:1.12 in contrast to the definite selectivity sequence for the anions f : br : cl : i : hco3 = 0.44:1.38:1.08:2.05:0.60 .
C0003075
anions
C0016327
f