Level of Heavy Metals and Potential Ecological Risks in Irrigated Horticultural Farms in the Vicinity of Lake Ziway, Central Ethiopian Rift Valley Region

Table 7

Single element potential ecological risk factor (ER) and potential ecological risk index (ERI) at different sampling sites, n = 15.

Site	ER									ERI
	As	Pb	Zn	Cd	Hg	Cu	Ni	Co	Cr
1	3.5	3.9	0.39	36.6	92.8	1.3	1.05	1.75	0.26	141.55
2	3.6	4.0	0.38	39.9	106.4	1.1	1.25	2.05	0.24	158.92
3	1.9	1.2	0.23	9.9	63.6	0.45	0.25	0.3	0.08	77.86