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

	pH (CaCl₂)	C_org [%]	K_F [mL/g] QE	1/n	K_F [mL/g] QA	1/n	K_F [mL/g] 3-OH-QA	1/n	K_F [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		2.3/1.0/2.0/2.0^a	39		5.2		2.6		9.9
Arithm. mean				0.86		0.81		0.93		0.66