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Table 5 Contamination factor (CF) and Pollution load index (PLI) value of heavy metals in surface and core sediments

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

Site Layer (cm) CF Cr CF Cu CF Ni CF Pb CF Zn PLI
S1 0–5 1.01 0.62 0.62 1.06 0.63 0.76
S2 0–5 1.02 0.62 0.61 1.07 0.65 0.77
S3 0–5 1.28 0.98 0.74 1.04 0.78 0.94
S4 0–5 1.18 0.71 0.71 1.04 0.70 0.85
S5 0–5 1.17 1.00 0.73 1.10 0.69 0.92
C1 0–1 1.33 0.77 0.75 1.10 0.74 0.91
2–3 1.33 1.06 0.86 1.12 0.82 1.02
4–5 1.31 1.04 0.86 1.11 0.81 1.01
6–7 1.04 0.54 0.60 1.01 0.53 0.71
8–9 1.03 0.57 0.58 1.02 0.54 0.71
10–11 1.19 0.80 0.73 1.12 0.70 0.88
12–13 1.26 0.98 0.78 1.17 0.77 0.97
14–15 1.35 1.04 0.84 1.12 0.86 1.03
16–17 1.08 0.72 0.68 1.03 0.68 0.82
18–19 1.55 1.76 1.00 1.20 1.22 1.32
20–21 1.55 1.39 1.00 1.24 1.07 1.23
22–23 1.45 1.27 0.93 1.19 0.93 1.14
24–25 1.29 0.97 0.76 1.10 0.74 0.95
26–27 1.14 0.78 0.68 1.12 0.71 0.86
28–29 1.19 0.87 0.71 1.09 0.73 0.90
30–31 1.15 0.81 0.69 1.07 0.67 0.86
32–33 1.17 0.81 0.69 1.11 0.70 0.87
34–35 1.13 0.82 0.69 1.06 0.70 0.86
36–37 1.16 0.82 0.70 1.09 0.76 0.89
38–39 1.17 0.91 0.70 1.14 0.68 0.90
40–41 1.32 1.09 0.78 1.15 0.82 1.01
42–43  1.36 1.10 0.84 1.08 0.93 1.05