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Table 8 Experimental partition coefficients Kd at initial (P)HCA concentrations of 1.0 and 100 mmol L−1 and parameters of the composite Langmuir–Freundlich isotherm for (P)HCA distribution in the gibbsite/ACPW system (pH 13.3)

From: Adsorption of aliphatic polyhydroxy carboxylic acids on gibbsite: pH dependency and importance of adsorbate structure

(P)HCA K ad1,100 L kg−1 X2/DoF r 2 c bsat  ± SD mmol kg−1 K bL  ± SD L mmol−1 K bF  ± SD mmol1−n Ln kg−1 nb ± SD
GLY 8.68 0.205 0.53 0.960 8.6 ± 1.6 1.35 ± 0.6 0.01 ± 0.02 1.57 ± 0.36
THR 18.6 n.a. 3.11 0.926 8.1 ± 1.3 4.0 ± 1.6 n.a. n.a.
TAR 60.5 1.10 1.49 0.959 10.5 ± 4.4 8.77 ± 4.80 5.65 ± 2.02 0.61 ± 0.07
GLU 41.8 1.01 2.66 0.939 20.0 ± 3.2 3.15 ± 1.27 0.45 ± 0.24 1.13 ± 0.10
GLA 30.2 1.75 2.31 0.961 80.7 ± 11.4 0.22 ± 0.06 6.02 ± 1.70 0.52 ± 0.05
  1. SD, standard deviation; n.a., not applicable
  2. aDistribution coefficient Kd at initial (P)HCA concentrations of 1.0 and 100 mmol L−1
  3. bComposite Langmuir–Freundlich isotherm parameter (Eq. 2)