Table 1

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

Table 1: Mean concentration of heavy metals (μgg^-1) in sediments during different seasonsfrom Arvand river, northwest of Persian Gulf