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Table 3 CMC values at pH 7 for use as surrogate water solubility values for solubility ratio method calculations

From: A comparison of log Kow (n-octanol–water partition coefficient) values for non-ionic, anionic, cationic and amphoteric surfactants determined using predictions and experimental methods

Compound # CMC values (g/L) Octanol solubility (mg/mL)a
Using surface tension method [11]a Using SPME method [6] Mean of literature values [6] Mean and SD
C8EO4 1 3.2 3.899 ± 0.506 3.839 3.65 ± 0.387 FSO
C12EO4 2 0.0343 0.018 ± 0.002 0.040 0.0308 ± 0.011 FSO
C12EO8 3 0.06 0.048 ± 0.008 0.038b, 0.060 (0.049c) 0.0523 ± 0.007 93.9
C12AS 4 1.15 3.701 ± 0.746 2.344 2.40 ± 1.28 0.9
C12E4S 5 0.405 0.281 ± 0.067 0.726 0.471 ± 0.230 79.2
C11COONa 6 1.97 0.238 ± 0.035 5.800 2.67 ± 2.85 77.9
C12TMAC 7 4.06 4.467 ± 0.405 4.222 4.25 ± 0.205 729.9
C16TMAC 8 0.08 0.125 ± 0.024 0.306 0.170 ± 0.120 359.3
C18BAC 9 0.11 0.0012 ± 0.0002 0.101 0.071 ± 0.060 118.6
C12–16ADB 10 0.26 ND 0.480a 0.370 ± 0.156 19.6
C12ADB 10 ND 0.376 ± 0.116 0.451 0.414 ± 0.053 ND
C14ADB 10 ND 0.056 ± 0.010 ND NA ND
C16ADB 10 ND 0.0016 ± 0.0002 ND NA ND
C12AAPB 11 0.486 ND 0.318 0.402 ± 0.119 27.6
C12DAO 12 1.65 0.067 ± 0.015 0.480 0.732 ± 0.821 FSO
ATR 13 ND 0.039 ± 0.005b 0.035b 0.0370 ± 0.003 46
PCP 14 ND 0.658 ± 0.102b 1.153b 0.906 ± 0.350 7.4
  1. FSO Test compounds is fully soluble in n-octanol and so not measurable, ND not determined, NA not applicable
  2. aAs reported by Fraunhofer IME in this study
  3. bBased on water solubility values, not the CMC
  4. cAverage of the two values