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Table 5 Freundlich adsorption coefficients (KF) and exponents (1/n) of QE, QA, 3-OH-QA, and 3-OH-CQO

From: Degradation and sorption of the herbicides 2,4-D and quizalofop-P-ethyl and their metabolites in soils from railway tracks

  pH (CaCl2) Corg [%] KF [mL/g] QE 1/n KF [mL/g] QA 1/n KF [mL/g] 3-OH-QA 1/n KF [mL/g] 3-OH-CQO 1/n
Soils from railway tracks
 EB 7.7 0.15 66 0.76 5.4 0.81 2.1 0.78 2.0 0.74
 MBS 7.6 0.31 47 0.97 0.99 0.79 0.62 0.77 3.1 0.74
 MR 7.6 ≈ 0.04 1.5 0.77 0.17 0.76 0.16 0.84 0.52 0.65
 CS 7.5 < 0.06 6.5 0.70 0.96 0.64 0.83 0.60 0.35 0.48
 Geom. mean   ≈ 0.1 13   0.96   0.65   1.0  
 Arithm. mean     0.80   0.75   0.75   0.65
Agricultural soils [17]
 Min–max 4.3–8.1 0.06–5.9 15–99 0.83–0.88 0.19–40 0.69–0.89 0.8–10 0.80–1.07 5.5–22 0.59–0.80
 Geom. mean   2.3/1.0/2.0/2.0a 39   5.2   2.6   9.9  
 Arithm. mean     0.86   0.81   0.93   0.66
  1. Confidence intervals are given in Additional file 1: Table S7
  2. aIn adsorption studies with QE/QA/3-OH-QA/3-OH-CQO