| TOXIC ELEMENT | APPLIED LAB METHOD/TECHNIQUE |
| (Ni) | APHA7 3111B (Electrothermal CS AAS) |
| (Cu) | APHA 3111B (Electrothermal CS AAS) |
| (Zn) | APHA 3111B (Flame AAS) |
| (Pb) | APHA 3111B (Electrothermal CS AAS) |
| (Cd) | APHA 3111B (Electrothermal CS AAS) |
| (Fe) | APHA 3111B (Electrothermal CS AAS) |
| (Cr) | APHA 3111B (Electrothermal CS AAS) |
| (Mn) | APHA 3111B (Electrothermal CS AAS) |
| (Hg) | ISO 17852:2016 (CV-AFS) |
| (As) | ISO 11969:1996 (ET-CS-HRAAS) |
| (V) | APHA 3111B (Electrothermal CS AAS) |