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Table IV Percentages of trace elements in the successive extractions for both 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

Sample No.

 

Exchangeable

Acidic

Reducible

Oxidizable

Residual

Ag

Recent filling

4

0.00

0.00

9.48

60.20

30.32

 

dredged sediments

5

0.00

0.02

14.26

18.84

66.88

 

Older dredged

2

0.00

0.04

3.71

27.32

68.94

 

sediments

1

0.002

0.003

7.29

3.95

88.71

 

Deep local

7

0.01

0.00

3.30

0.89

95.80

 

aquifer sediments

9

0.02

0.03

3.00

1.76

95.19

 

Shallow local

6

0.00

0.00

2.13

0.40

97.47

 

aquifer sediments

8

0.02

0.02

6.11

0.56

93.30

Cd

Recent filling

4

5.03

40.40

35.97

12.29

6.30

 

dredged sediments

5

0.97

17.22

54.73

4.41

22.68

 

Older dredged

2

1.66

31.10

22.72

1.82

42.70

 

sediments

1

3.12

23.28

22.07

2.64

48.89

 

Deep local

7

2.11

4.68

33.83

4.02

55.36

 

aquifer sediments

9

2.23

5.54

27.97

3.00

61.27

 

Shallow local

6

0.37

1.57

10.11

2.48

85.47

 

aquifer sediments

8

0.54

2.01

12.97

2.38

82.11

Sb

Recent filling

4

1.14

4.04

1.80

1.04

91.98

 

dredged sediments

5

0.92

2.69

1.06

0.69

94.64

 

Older dredged

2

1.26

5.44

1.48

0.91

90.90

 

sediments

1

0.92

2.53

1.01

0.87

94.67

 

Deep local

7

0.29

0.32

0.73

0.61

98.05

 

aquifer sediments

9

0.16

0.31

1.29

0.82

97.43

 

Shallow local

6

0.25

0.28

0.71

0.48

98.28

 

aquifer sediments

8

0.08

0.22

0.81

0.59

98.30

Tl

Recent filling

4

0.91

1.24

6.62

4.47

86.76

 

dredged sediments

5

0.59

0.96

4.91

3.39

90.15

 

Older dredged

2

0.88

1.34

5.73

4.28

87.76

 

sediments

1

0.57

0.62

2.73

2.01

94.08

 

Deep local

7

0.28

0.24

1.95

1.73

95.80

 

aquifer sediments

9

0.63

0.47

4.34

2.08

92.47

 

Shallow local

6

0.32

0.30

5.71

3.55

90.13

 

aquifer sediments

8

0.23

0.19

4.58

1.92

93.09

Pb

Recent filling

4

0.03

10.36

61.19

21.97

6.45

 

dredged sediments

5

0.08

20.39

59.67

9.53

10.32

 

Older dredged

2

0.03

16.72

55.52

12.62

15.11

 

sediments

1

0.06

10.11

46.86

11.63

31.35

 

Deep local

7

0.03

3.24

39.43

9.35

47.94

 

aquifer sediments

9

0.03

5.75

40.37

5.68

48.17

 

Shallow local

6

0.04

6.58

45.84

7.48

40.07

 

aquifer sediments

8

0.04

7.51

49.77

6.09

36.60

Cr

Recent filling

4

0.01

1.86

16.09

13.99

68.04

 

dredged sediments

5

0.02

1.48

9.78

7.33

81.39

 

Older dredged

2

0.01

1.51

9.93

7.75

80.80

 

sediments

1

0.01

1.03

6.30

5.37

87.29

 

Deep local

7

0.01

0.07

10.87

5.23

83.82

 

aquifer sediments

9

0.10

0.04

4.40

3.60

91.86

 

Shallow local

6

0.03

0.06

6.96

4.20

88.76

 

aquifer sediments

8

0.03

0.05

9.66

2.78

87.47

Fe

Recent filling

4

0.00

0.85

29.26

4.73

65.16

 

dredged sediments

5

0.00

1.72

29.04

2.04

67.21

 

Older dredged

2

0.00

1.45

28.98

2.11

67.45

 

sediments

1

0.00

1.31

24.19

1.28

73.21

 

Deep local

7

0.00

0.01

21.71

1.46

76.82

 

aquifer sediments

9

0.00

0.01

25.33

1.74

72.92

 

Shallow local

6

0.00

0.00

17.57

1.31

81.11

 

aquifer sediments

8

0.00

0.00

25.00

1.03

73.97

Ni

Recent filling

4

0.13

5.09

28.16

11.00

55.63

 

dredged sediments

5

0.13

5.37

21.13

9.28

64.09

 

Older dredged

2

0.09

5.84

20.43

7.28

66.36

 

sediments

1

0.10

3.45

14.34

6.07

76.04

 

Deep local

7

0.55

1.49

24.37

4.18

69.41

 

aquifer sediments

9

0.13

0.55

11.01

6.07

82.25

 

Shallow local

6

0.19

0.15

6.32

6.95

86.39

 

aquifer sediments

8

0.23

0.17

7.29

3.18

89.12

Cu

Recent filling

4

0.22

7.48

22.10

45.50

24.71

 

dredged sediments

5

0.12

4.87

16.96

25.78

52.28

 

Older dredged

2

0.16

5.87

14.69

29.38

49.90

 

sediments

1

0.19

4.19

13.25

20.96

61.41

 

Deep local

7

0.07

2.54

45.15

9.01

43.23

 

aquifer sediments

9

0.11

1.01

23.43

8.19

67.26

 

Shallow local

6

0.06

0.34

11.79

7.31

80.50

 

aquifer sediments

8

0.06

0.34

13.67

4.46

81.47

Zn

Recent filling

4

0.12

18.20

56.30

12.98

12.41

 

dredged sediments

5

0.07

14.34

48.42

5.92

31.25

 

Older dredged

2

0.04

13.96

38.31

7.07

40.62

 

sediments

1

0.13

3.42

20.99

6.88

68.59

 

Deep local

7

0.04

1.56

32.63

9.27

56.49

 

aquifer sediments

9

0.01

0.45

18.26

9.10

72.18

 

Shallow local

6

0.01

0.15

8.71

8.08

83.05

 

aquifer sediments

8

0.02

0.20

11.70

5.13

82.95

As

Recent filling

4

0.27

3.07

37.98

4.64

54.04

 

dredged sediments

5

0.60

3.40

24.75

1.89

69.36

 

Older dredged

2

0.47

3.17

24.24

1.47

70.65

 

sediments

1

0.46

2.46

19.99

0.55

76.53

 

Deep local

7

0.27

0.54

17.35

1.34

80.49

 

aquifer sediments

9

0.00

0.18

5.22

0.00

94.60

 

Shallow local

6

0.00

0.17

1.47

0.00

98.36

 

aquifer sediments

8

0.13

0.26

1.96

0.00

97.64

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Geochemical Transactions

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