Table 4 Prescribed specification of the World Health Organization (WHO), EPA and Indian standard (BIS 2012) for trace elements
Trace metals | WHO (MCL) (mg/L) | EPA (MCL) (mg/L) | BIS (IS 10500:2012) | |
|---|---|---|---|---|
Requirement (Acceptable Limit) | Permissible Limit in the absence of alternate source | |||
Mn | 0.08 | Â | 0.1 | 0.3 |
Cu | 2 | 1.3 | 0.05 | 1.5 |
Pb | 0.01 | 0.015 | 0.01 | No relaxation |
Zn | Â | 5 | 5 | 15 |
Ni | 0.07 | Â | 0.02 | No relaxation |
Co | No Specific Limit | No Specific Limit | No Specific Limit | No Specific Limit |
As | 0.01 | 0.01 | 0.01 | 0.05 |
Se | 0.04 | 0.05 | 0.01 | No relaxation |
Cd | 0.003 | 0.005 | 0.003 | No relaxation |
Al | 0.1 | 0.2 | 0.03 | 0.2 |
Sr | No Specific Limit | No Specific Limit | No Specific Limit | No Specific Limit |
Cr | 0.05 | 0.1 | 0.05 | No relaxation |
Ba | 1.3 | 2 | 0.7 | No relaxation |
V | No Specific Limit | No Specific Limit | No Specific Limit | No Specific Limit |
Fe | Â | 0.3 | 0.3 | No relaxation |