Metal Station Season
April July October January
Cu S 1 20.3 ± 0.01c 22.5 ± 0.02c 18.1 ± 0.05c 14.4 ± 0.05a
S 2 12.l ± 0.02c 12.4 ± 0.01b 11.3 ± 0.01c 10.2 ± 0.06c
S 3 15.5 ± 0.03b 16.2 ± 0.04c 14.2 ± 0.05c 13.4 ± 0.05b
S 4 10.4 ± 0.04b 15.2 ± 0.40c 17.2 ± 0.02c 13.8 ± 0.02b
Ni S 1 34.6 ± 0.01c 38.2 ± 0.01c 34.1 ± 0.01b 20.8 ± 0.01b
S 2 40.4 ± 0.05c 51.4 ± 0.04c 42.2 ± 0.05c 35.2 ± 0.06b
S 3 51.5 ± 0.01c 64.5 ± 0.06c 45.1 ± 0.04c 42.5 ± 0.05c
S 4 23.1 ± 0.b 28.2 ± 0.04c 35.3 ± 0.06b 21.5 ± 0.01b
Co S 1 17.2 ± 0.05b 15.1 ± 0.06c 16.3 ± 0.01c 17.5 ± 0.01c
S 2 18.4 ± 0.03b 17.1 ± 0.05c 16.5 ± 0.01c 16.2 ± 0.01b
S 3 25.1 ± 0.02c 23.5 ± 0.01c 22.2 ± 0.01c 21.2 ± 0.06c
S 4 16.2 ± 0.01b 14.4 ± 0.04c 15.1 ± 0.01b 14.5 ± 0.04b
Pb S 1 7.1 ± 0.02b 8.2 ± 0.04c 6.2 ± 0.04c 3.31± 0.06c
S 2 3.4 ± 0.06c 5.1 ± 0.03c 2.4 ± 0.01c 1.22 ± 0.03c
S 3 7.1 ± 0.03b 6.1 ± 0.01c 3.1 ± 0.05c 0.71 ± 0.04a
S 4 2.2 ± 0.05c 4.2 ± 0.03c 1.1 ± 0.03c 0.52 ± 0.09a
Cd S 1 0.36 ± 0.01a 0.28 ± 0.04a 0.19 ± 0.02a 0.21 ± 0.05c
S 2 0.21 ± 0.06c 0.18 ± 0.03a 0.14 ± 0.01b 0.15 ± 0.04b
S 3 0.30 ± 0.04c 0.19 ± 0.04a 0.16 ± 0.01b 0.15 ± 0.03b
S 4 0.15 ± 0.03b 0.12 ± 0.01b 0.15 ± 0.06a 0.11 ± 0.04c
Hg S 1 0.03 ± 0.03c 0.07 ± 0.05a 0.04 ± 0.01a 0.04 ± 0.03a
S 2 0.20 ± 0.02b 0.30 ± 0.01c 0.10 ± 0.02c 0.08 ± 0.01b
S 3 0.30 ± 0.06b 0.60 ± 0.03c 0.20 ± 0.01c 0.10 ± 0.06b
S 4 0.01 ± 0.07a 0.05 ± 0.02b 0.02 ± 0.04a 0.01 ± 0.03a
Table 1: Mean concentration of heavy metals (μgg-1) in sediments during different seasonsfrom Arvand river, northwest of Persian Gulf