Distribution and Identification of Sources of Heavy Metals in the Voghji River Basin Impacted by Mining Activities (Armenia)

Table 2

Water quality assessment objectives of heavy metals for Voghji River basin.

Heavy metal	Quality class
	I	II	III	IV	V
Zn, µg/L	3	100	200	500	>500
Cu, µg/L	4	24	50	100	>100
Cr, µg/L	0.5	10.5	100	250	>250
As, µg/L	0.3	20.3	50	100	>100
Cd, µg/L	0.1	1.1	2.1	4.1	>4.1
Pb, µg/L	0.1	10.1	25	50	>50
Ni, µg/L	0.6	10.6	50	100	>100
Mo, µg/L	15	30	60	120	>120
Mn, µg/L	4	8	16	32	>32
V, µg/L	0.4	10	20	100	>100
Co, µg/L	0.09	0.18	0.36	0.72	>0.72
Fe, mg/L	0.03	0.06	0.5	1.0	>1.0
Sb, µg/L	0.5	1	2	4	>4
Ti, µg/L	1.5	10	20	100	>100
Se, µg/L	1.1	20	40	80	>80