Table 2.

Concentrations (mg/L) of ten different heavy metals in surface water of six different stations in Naf River.

Sample ID	Cr 52	Mn 55	Co 59	Ni 60	Cu 63	Zn 66	As 75	Se 82	Cd 111	Pb 208
Station 1	0.0063	0.0917	0.0004	0.0027	0.0462	1.3358	0.0017	0.0714	0.2929	1.8954
Station 2	0.0038	0.0528	0.0005	0.0039	0.0431	1.1541	0.0020	0.0535	0.0862	3.6577
Station 3	0.0060	0.0804	0.0007	0.2863	0.0359	1.0690	0.0005	0.0867	0.0820	1.7616
Station 4	0.0034	0.0392	0.0002	0.0091	0.0406	1.0351	0.0030	0.0903	0.1643	5.4517
Station 5	0.0027	0.0211	0.0002	0.0289	0.0312	1.3888	0.0010	0.0737	0.0692	4.7083
Station 6	0.0059	0.2806	0.0014	0.0550	0.0380	0.4860	0.0027	0.0867	0.0247	1.7157
Average	0.0047	0.0943	0.0006	0.0643	0.0392	1.0781	0.0018	0.0770	0.1197	3.1984
SD	0.0016	0.0949	0.0004	0.1106	0.0053	0.3229	0.0010	0.0138	0.0957	1.6449