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Table 1 Methods for water analysis and limit values

From: Assessment of surface water quality and monitoring in southern Vietnam using multicriteria statistical approaches

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
  1. * National technical regulation on surface water quality (QCVN 08-MT:2015/BTNMT), column A1 used for water supply [7]