Table 2.

Physicochemical properties of the cations evaluated.

Code	Cation	MW (daltons)	104.Mobility cm2.s−1.V−1	Transport number t°C+ (Mean ± SD)
1	Lithium	6	4.00	0.54 ± 0.06 a
2	Sodium	23	5.40	0.59 ± 0.06 a
3	Potassium	39	7.56	0.77 ± 0.19 a
4	Ammonium	18	7.81	0.70 ± 0.15 a
5	Tetra-N-methylammonium	74	3.90	0.50 ± 0.04
6	Tetra-N-ethylammonium	130	1.97	0.40 ± 0.04
7	Tetra-N-proylammonium	186	1.80	0.33 ± 0.02
8	Choline	104	3.35	0.59 ± 0.03
9	Butyrylthiocholine	190	2.53	0.27 ± 0.04
10	Carbamoylcholine	147	2.72	0.46 ± 0.05
11	Neostigmine	223	3.15	0.41 ± 0.01
12	Pyridostigmine	181	2.94	0.51 ± 0.03
13	Lidocaine	234	1.49	0.16 ± 0.02b
14	Ropinirole	262	1.60	0.10 ± 0.01c
15	Propranolol	259	1.49d	0.03 ± 0.01b
16	Quinine	324	0.88	0.02 ± 0.01b

^aData from [34]

^bData from [20]

^cData from [21]

^dMobility measured using capillary zone electrophoresis [31]