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Table III Total extractable fractions of trace elements in the dredged sediments and the local aquifer sediments. (Note: Because there are no data for the residual phase of Sample 4, percentages of trace elements in the successive extractions were calculated assuming the recoveries of all metals are 100%.)

From: Potential contaminants at a dredged spoil placement site, Charles City County, Virginia, as revealed by sequential extraction

 

Trace element

The dredged sediments

The local aquifer sediments

  

Recent filling

Older

Deep

Shallow

  

No. 4

No. 5

No. 2

No. 1

No. 7

No. 9

No. 6

No. 8

Total extractable fraction (%)

Ag

69.68

33.12

31.06

11.29

4.20

4.81

2.53

6.70

 

Cd

93.70

77.32

57.30

51.11

44.64

38.73

14.53

17.89

 

Sb

8.02

5.36

9.10

5.33

1.95

2.57

1.72

1.70

 

Tl

13.24

9.85

12.24

5.92

4.20

7.53

9.87

6.91

 

Pb

93.55

89.68

84.89

68.65

52.06

51.83

59.93

63.40

 

Cr

31.96

18.61

19.20

12.71

16.18

8.24

11.24

12.53

 

Fe

34.84

32.79

32.55

26.79

23.18

27.08

18.89

26.03

 

Ni

44.37

35.91

33.64

23.96

30.59

17.75

13.61

10.88

 

Cu

75.29

47.72

50.10

38.59

56.77

32.74

19.50

18.53

 

Zn

87.59

68.75

59.38

31.41

43.51

27.82

16.95

17.05

 

As

45.96

30.64

29.35

23.47

19.51

5.40

1.64

2.34