Metal ion source | Experimental concentration, mg/dm3 |
Fe3+: FeCl3·6H2O | 20, 40, 60, 80, |
Cu2+: Cu(NO3)2·6H2O | 10, 20, 40, 60, 80 |
Zn2+: ZnSO4·7H2O | 10, 20, 50 |
Cr3+: Cr2(SO4)3·6H2O | 10, 20, 35, 50 |