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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