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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