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Table 3 Two-site Langmuir isotherm fitting parameters for sorption of gluconic acid on gibbsite at various pH values

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

pH χ2/DoF r 2 KL1 ± SD L mmol−1 Csat1 ± SD mmol kg−1 KL2 ± SD L mmol−1 Csat2 ± SD mmol kg−1
4 0.674 0.912 51 ± 51 6.4 ± 1.5 0.069 ± 0.032 33 ± 5
7 0.072 0.979 48 ± 76 6.0 ± 1.8 0.053 ± 0.045 19 ± 5
9 0.362 0.981 63 ± 111 1.57 ± 0.57 0.0015 ± 0.0009 325 ± 149
12 2.40 0.920 3.70 ± 2.05 2.05 ± 1.91 0.0038 ± 0.0012 274 ± 57
  1. X2/DoF, probability distribution normalized to the number of data points; r2, determination coefficient; KL, Langmuir affinity constant (1: “high”, 2: “low” affinity sites); Csat, saturation concentration; SD, standard deviation