Table 1.

Ecological Risk Category of Metals

Eir value	Level of Ecological Risk of Metal	RI Value	Ecological Risk Category
Eir < 40	Low risk	RI < 110	Low risk
40 ≤ Eir < 80	Moderate risk	110 ≤ RI < 200	Moderate risk
80 ≤ Eir < 160	Considerable risk	200 ≤RI <400	Considerable risk
160 ≤ Eir < 320	High risk	400 ≤ RI	Very high risk
320 ≤ Eir	Very high risk

Abbreviations: RI, ecological risk index; Eir, ecological risk factor