Table 3.

Pollution factor and Nemerow index of the heavy metals.

	Pi = C/B As	Pi = C/B Cd	Pi = C/B Co	Pi = C/B Cu	Pi = C/B Cr	Pi = C/B Hg	Pi = C/B Ni	Pi = C/B Pb	Pi = C/B Zn	Pimax	Piave	IN
Mean ($\overline{x}$)	1.18	1.16	1.55	1.54	1.49	1.54	1.40	1.50	1.67	2.75	1.45	2.20
Median (Me)	1.15	0.86	1.47	1.30	1.25	1.30	1.28	1.06	1.63	2.52	1.35	2.06
Minimum (min)	0.32	0.57	0.31	0.09	0.14	0.19	0.24	0.24	0.20	0.78	0.47	0.65
Maximum (max)	2.77	5.43	4.27	4.37	4.11	8.41	4.31	7.78	3.38	8.41	2.98	6.26
Standard deviation (S)	0.62	0.80	0.77	0.95	0.98	1.17	0.78	1.21	0.69	1.31	0.49	0.96