Table 2. Mean values of the pH, particle size, organic carbon (O. C.), cation-exchange capacity (CEC), CaCO3, and Fe total (Fe) content at different depths in contaminated soils (reddish-yellow band, in cursive).

depth

pH

Sands

Silts

Clays

OC

CEC

CaCO3

Fe

 

 

SE

%

SE

%

SE

%

SE

%

SE

cmolc kg-1

SE

%

SE

%

SE

0-1

5.6

0.2

nd

nd

nd

nd

5.6

0.9

0.41

0.08

nd

nd

nd

nd

5.46

0.5

1-2

6.0

0.1

nd

nd

nd

nd

5.9

0.8

0.33

0.04

nd

nd

3.3

0.5

4.62

0.7

2-3

6.3

0.1

nd

nd

nd

nd

6.4

0.8

nd

nd

nd

nd

1.9

0.4

4.09

0.6

3-4

6.8

0.1

nd

nd

nd

nd

6.7

0.8

nd

nd

nd

nd

3.0

0.2

3.99

0.3

4-6

7.6

0.1

nd

nd

nd

nd

11.0

0.4

0.49

0.05

nd

nd

10.5

0.9

2.70

0.2

13-15

7.9

0.1

nd

nd

nd

nd

11.4

0.5

0.50

0.03

nd

nd

12.7

1.1

2.73

0.3

28-30

8.0

0.1

nd

nd

nd

nd

11.7

0.8

0,55

0.02

nd

nd

13.1

1.0

2.76

0.3

100-150

8.0

0.1

53.2

2.2

32.1

1.6

14.7

1.4

0.60

0.07

16.2

1.5

12.8

0.6

2.89

0.2

SE, standar error; nd, not determined.