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

Environmental Sciences Europe

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

	pH (CaCl₂)	C_org [%]	K_F [mL/g] 2,4-D	1/n	K_F [mL/g] 2,4-DCP	1/n	K_F [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