G1 G2 SDS
No Analytes log Powa log Pmw b log Pmw log Pmw
NHB solutes
1 Benzene 2.13 1.91 0.22 1.91 0.22 1.59 0.54
2 Toluene 2.69 2.32 0.37 2.32 0.37 2.03 0.66
3 Chlorobenzene 2.84 2.51 0.33 2.49 0.35 2.14 0.70
4 Bromobenzene 2.99 2.71 0.28 2.65 0.34 2.29 0.70
5 Ethylbenzene 3.15 2.69 0.46 2.67 0.48 2.40 0.75
6 p-Xylene 3.15 2.71 0.44 2.70 0.45 2.45 0.70
7 4-Chlorotoluene 3.33 2.90 0.43 2.88 0.45 2.58 0.75
8 Iodobenzene 3.25 2.98 0.27 2.91 0.34 2.53 0.72
9 Propylbenzene 3.68 3.11 0.57 3.07 0.61 2.84 0.84
10 Naphthalene 3.35 3.24 0.11 3.17 0.18 2.71 0.64
Absolute mean c     0.35    0.38    0.70
HBA solutes
11 Benzonitrile 1.56 1.71 -0.15 1.81 -0.25 1.65 -0.09
12 Acetophenone 1.58 1.76 -0.18 1.86 -0.28 1.83 -0.25
13 Nitrobenzene 1.85 1.98 -0.13 2.04 -0.19 1.72 0.13
14 Methyl benzoate 2.16 2.10 0.06 2.19 -0.03 2.12 0.04
15 Propiophenone 2.20 2.12 0.08 2.19 0.01 2.14 0.06
16 4-Chloroacetophenone 2.35 2.35 0.00 2.41 -0.06 2.35 0.00
17 4-Nitrotoluene 2.45 2.38 0.07 2.45 0.00 2.17 0.28
18 Ethyl benzoate 2.64 2.46 0.18 2.54 0.10 2.48 0.16
19 4-Chloroanisole 2.82 2.73 0.09 2.71 0.11 2.40 0.42
Absolute mean c      0.10    0.10    0.17
HBD solutes
20 Benzyl alcohol 1.08 1.56 -0.48 1.66 -0.58 1.36 -0.28
21 Phenol 1.49 2.24 -0.75 2.32 -0.83 1.32 -0.17
22 3-Methylphenol 1.96 2.42 -0.46 2.49 -0.53 1.48 -0.48
23 4-Chloroaniline 1.83 2.60 -0.77 2.53 -0.70 1.94 -0.11
24 4-Flourophenol 1.77 2.61 -0.84 2.69 -0.92 1.73 0.04
25 4-Ethylphenol 2.58 2.98 -0.40 3.05 -0.47 2.15 0.43
26 4-Chlorophenol 2.35 3.08 -0.73 3.13 -0.78 2.00 0.35
27 3-Chlorophenol 2.49 3.16 -0.67 3.21 -0.72 1.98 0.51
28 4-Bromophenol 2.59 3.29 -0.70 3.31 -0.72 2.16 0.43
29 3-Bromophenol 2.63 3.37 -0.74 3.40 -0.77 2.14 0.49
Absolute mean c     0.65   0.70    0.33
Alkyl phenyl ketones
30 Butyrophenone 2.73 2.49 -0.24 2.56 -0.17 2.54 -0.19
31 Valerophenone 3.26 2.89 -0.37 2.94 -0.32 2.94 -0.32
32 Hexanophenone 3.79 3.34 -0.45 3.36 -0.43 3.37 -0.42
33 Heptanophenone 4.32 3.83 -0.49 3.78 -0.54 3.85 -0.47
Absolute mean c     0.30   0.30   0.28
Overall absolute mean d     0.35   0.37   0.37
aLiterature values. From reference [16].
bΔ=log Pow(Lit)- log Pmw(MEKC)
cAbsolute mean of differences for each subset solutes.
dAbsolute mean of differences for all solutes.
Table 4: Estimated log Pmw values obtained from phase ratios.