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Table 4 Freundlich adsorption coefficients (KF) and exponents (1/n) of 2,4-D, 2,4-DCP, and 2,4-DCA

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] 2,4-D 1/n KF [mL/g] 2,4-DCP 1/n KF [mL/g] 2,4-DCA 1/n
Soils from railway tracks
 EB 7.7 0.15 0.28 0.69 3.32 0.83 10 0.58
 MBS 7.6 0.31 0.14 0.75 0.96 0.75 1.4 0.77
 MR 7.6 ≈ 0.04 0.04 0.62 0.08 0.63 0.43 0.47
 CS 7.5 < 0.06 0.07 0.61 0.14 0.88 0.93 0.65
 Geom. mean   ≈ 0.1 0.10   0.43   1.5  
 Arithm. mean     0.67   0.77   0.62
Agricultural soils [13]a
 Min–max 5.0–7.5 0.9–4.4 0.19–0.83 0.78–0.90 3–25 0.80–0.94 10–27 0.85–0.95
 Geom. mean   1.8 0.40   8.3   18  
 Arithm. mean     0.83   0.88   0.92
  1. Confidence intervals are given in Additional file 1: Table S6
  2. aSoils M800–M822 considered