[NaCl]

0.00

0.05

0.10

0.11

0.12

0.13

0.14

0.15

0.20

0.50

K'

0.92

1.11

1.61

1.23

1.31

1.37

1.45

1.75

1.45

1.67

W h/2

0.55

0.53

0.56

0.40

0.27

0.27

0.26

0.22

0.20

0.27

Asmm

3.75

1.57

1.40

1.09

1.54

1.39

1.73

1.29

1.50

1.59
Table 1: Retention factor (K’), width al half height in ml (W h/2) and asimmetry (Asmm) of the main peak in Figure 1a as function of the NaCl molar concentration. Separation conditions as reported under “Chromatographic procedures”.