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Table 3 Water quality in the identified clusters

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

Cluster Temp pH TDS EC TSS DO BOD COD N-NH4+ N-NO3 NO2-N Fe Pb Cd As Cl
1 28.79 7.21 21 44 48 7.04 3.7 12 0.30 0.61 0.00 3.37 0 0 0 6.6
2 29.38 7.12 144 289 25 5.19 3.8 12 0.28 0.96 0.01 1.91 0 0 0 58
3 30.06 7.32 829 1715 59 5.09 3.7 14 0.23 1.10 0.02 2.54 0 0 0 11
4 29.74 7.21 32 71 28 6.28 2.3 9.6 0.19 0.76 0.01 1.94 0.01 0 0 2.2
5 30.37 7.22 37 83 18 6.03 4.4 13 0.55 0.57 0.00 1.48 0 0 0 7.0
6 30.16 7.76 97 221 38 6.60 2.8 9.0 0.26 0.41 0.00 1.90 0 0 0 10.1
7 30.23 6.46 58 129 21 2.68 6.7 18 0.76 0.70 0.02 1.56 0 0 0 24
8 29.75 6.39 204 443 33 1.35 11 27 1.90 0.47 0.01 4.38 0 0 0 0.0
9 30.90 6.14 1481 3067 19 3.09 6.8 19 0.60 1.10 0.03 0.97 0 0 0 1467
10 29.67 6.92 1648 3418 50 1.68 8.1 22 1.06 1.48 0.06 1.67 0 0 0 105
11 30.48 7.07 3496 6862 73 1.92 12 31 1.68 1.98 0.34 1.95 0 0 0 0.0
12 29.15 7.16 608 1237 97 0.68 49 91 15.02 0.06 0.02 1.90 0.02 0 0 0.0
13 29.99 7.20 1144 2387 81 0.77 22 47 5.34 0.34 0.02 2.69 0 0 0 0.0
14 31.43 7.19 8305 16,102 80 4.71 6.8 33 0.17 1.18 0.03 3.36 0 0 0 6119
15 30.81 7.44 21,829 40,967 18 5.21 2.5 12 0.14 0.87 0.10 0.32 0 0 0 0.0
Limits 20 ≥ 6 4 10 0.3 2 0.05 0.5 0.02 0.005 0.001 250