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Environmental Sciences Europe

Table 3 Freundlich adsorption coefficients (KF) and exponents (1/n) in soils from railway tracks and various topsoils

From: Degradation and sorption of the herbicide pelargonic acid in subsoils below railway tracks compared to a range of topsoils

 

pH in experimenta

Corg [%]

Soil:solution ratio

Fraction adsorbed

[%]

KF b

[mL/g]

95% CI c

KFoc

[mL/g]

95% CI c

1/n

R2

Subsoils from railway tracks

  

Wabern

6.85

0.21

1: 1

2–13

0.060

(0.052–0.068)

28.4

(0.74–0.90)

0.82

0.986

Lanzenhäusern

7.32

0.54

1: 1

10–24

0.160

(0.144–0.178)

29.6

(0.88–0.99)

0.95

0.993

Nottwil

7.44

0.78

1: 1

18–33

0.313

(0.293–0.334)

40.1

(0.93–1.01)

0.97

0.998

Mean values d

      

32.3

 

0.91

 

topsoils (sorted by pH)

  

Etziken

3.73

2.3

1: 5

55–61

6.84

(6.46–7.24)

297

(0.95–1.01)

0.98

0.999

Dulliken

3.83

2.1

1: 5

49–59

5.95

(5.48–6.47)

284

(0.91–1.00)

0.95

0.997

Steig

3.98

10.7

1: 5

88–90

39.7

(37.4–42.2)

371

(0.97–1.01)

0.99

0.999

Schafisheim

4.38

1.6

1: 5

36–45

3.53

(3.32–3.76)

221

(0.94–1.00)

0.97

0.998

Entlebuch

4.87

3.7

1: 5

59–65

7.67

(7.13–8.24)

207

(0.95–1.02)

0.98

0.998

Möhlin

5.22

1.2

1: 1

49–57

1.17

(1.09–1.25)

97.5

(0.95–1.02)

0.98

0.998

Brislach

6.29

1.56

1: 1

31–41

0.532

(0.488–0.580)

34.1

(0.93–1.03)

0.98

0.996

Zuzwil

6.60

1.49

1: 1

12–26

0.224

(0.201–0.251)

15.1

(1.07–1.20)

1.14

0.995

Ins

7.02

7.5

1: 10

11–21

2.02

(1.80–2.26)

26.9

(0.93–1.07)

1.00

0.993

Burgdorf

7.06

2.4

1: 1

18–39

0.378

(0.281–0.505)

15.7

(0.88–1.27)

1.07

0.961

Sargans

7.21

3.18

1: 1

24–48

0.364

(0.351–0.377)

11.4

(0.97–1.01)

0.99

0.999

Kestenholz

7.24

2.8

1: 1

24–34

0.414

(0.376–0.456)

14.8

(0.96–1.07)

1.01

0.995

Mean values (our data, topsoils) d

  

acidic soils (pH ≤ 6.2, n = 6)

228

 

0.976

 
   

alkaline soils (pH > 6.2, n = 6)

18.2

 

1.03

 

Values used for exposure modelling in the EU e

 

acidic soils (pH ≤ 6.2, n = 2)

95

 

1

 
    

alkaline soils (pH > 6.2, n = 2)

8.4

 

0.987

 
  1. aMeasured in soil suspensions after sampling for isotherm measurements (i.e. after autotclaving and agitation for 16 h)
  2. bThe unit of the distribution coefficient KF (μg1–1/n mL1/n g−1) was evaluated at a reference concentration cref = 1 μg mL−1
  3. c95% confidence interval dgeom. mean KFoc and arithm. mean 1/n e ref [14]
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