Table 1 Methods for water analysis and limit values
No. | Parameter | Unit | Analytical methods | Limit values* |
|---|---|---|---|---|
1 | Temp. | oC | SMEWW 2550B:2017 | – |
2 | pH | – | TCVN 6492:2011 | 6–8.5 |
3 | EC | mS cm− 1 | SMEWW 2510.B:2017 | – |
4 | TDS | mg L− 1 | SCEM_01 | – |
5 | DO | mg L− 1 | TCVN 12026:2018 | ≥ 6 |
6 | TSS | mg L−1 | SMEWW 2540.D:2017 | 20 |
7 | COD | mg L−1 | SMEWW 5220.C:2017 | 10 |
8 | BOD | mg L−1 | SMEWW 5210.B:2017 | 4 |
9 | N-NH4+ | mg L−1 | TCVN 6179–1:1996 | 0.3 |
10 | NO2−-N | mg L−1 | SMEWW 4500-NO2−.B:2017 | 0.05 |
11 | N-NO3− | mg L−1 | SMEWW 4500-NO3−.E:2017 | 2 |
12 | Fe | mg L−1 | SMEWW 3111.B:2017 | 0.5 |
13 | Pb | mg L−1 | SMEWW 3113.B:2017 | 0.02 |
14 | Cd | mg L−1 | SMEWW 3113.B:2017 | 0.005 |
15 | As | mg L−1 | SMEWW 3114.C:2017 | 0.01 |
16 | Cl− | mg L−1 | SMEWW 4500-Cl−.B:2017 | 250 |
17 | Hg | mg L−1 | SMEWW 3112.B:2017 | 0.001 |