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Table 2 Concentrations of Al and other heavy metal in surface and core sediment

From: Heavy metal accumulation during the last 30 years in the Karnaphuli River estuary, Chittagong, Bangladesh

Site Layer (cm) Al (%) Cr (mg/kg) Cu (mg/kg) Ni (mg/kg) Pb (mg/kg) Zn (mg/kg)
S1 0–5 4.67 77.70 20.34 35.01 24.26 59.69
S2 0–5 4.85 78.39 20.54 34.10 24.35 61.37
S3 0–5 5.86 99.08 32.26 41.27 23.66 74.32
S4 0–5 5.92 91.38 23.38 39.82 23.70 66.36
S5 0–5 5.92 90.54 33.06 41.10 25.05 65.89
C1 0–1 2.80 102.30 25.44 42.15 24.98 70.18
2–3 4.47 102.70 34.86 48.03 25.44 77.97
4–5 4.27 100.90 34.24 48.05 25.38 77.28
6–7 3.93 79.95 17.82 33.67 23.08 50.75
8–9 4.51 79.69 18.70 32.46 23.15 50.93
10–11 4.92 92.19 26.24 40.89 25.54 66.52
12–13 4.95 97.22 32.28 43.96 26.61 73.56
14–15 4.42 104.60 34.43 47.17 25.63 82.10
16–17 5.31 83.69 23.92 38.26 23.51 64.23
18–19 6.26 119.70 58.17 56.20 27.46 116.30
20–21 5.68 119.30 45.93 55.82 28.38 101.40
22–23 5.34 111.80 42.04 51.93 27.17 88.73
24–25 4.75 99.62 31.88 42.84 25.05 70.54
26–27 4.78 88.27 25.76 38.22 25.47 67.72
28–29 4.78 91.85 28.83 39.78 24.91 69.27
30–31 4.14 88.60 26.77 38.78 24.42 64.02
32–33 4.16 90.48 26.72 38.69 25.22 66.07
34–35 4.97 87.21 27.04 38.43 24.09 66.32
36–37 4.76 89.53 27.07 39.41 24.90 71.91
38–39 4.26 90.27 30.09 39.03 25.96 64.81
40–41 5.82 101.60 35.97 43.75 26.25 77.97
42–43 6.45 105.30 36.39 47.08 24.68 87.96
Background valuea   77.20 33.00 56.10 22.80 95.00
  1. aData from Banu (1995)