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Table 4

Variation of water quality of Cau River between the rainy season and the dry season

ParametersUnitsDry seasonRainy seasonQCVN08:A1
pH – 7.59 ± 0.20 7.44 ± 0.28 6.0–8.5 
Water temperature °C 25.49 ± 1.21 26.57 ± 0.84 – 
Total suspended solid mg/L 49.46 ± 21.59 54.52 ± 24.53 20 
Turbidity NTU 76.23 ± 51.27 77.84 ± 34.03 – 
Dissolved oxygen mg/L 6.11 ± 0.56 6.26 ± 0.55 ≥6 
Biochemical oxygen demand mg/L 3.93 ± 1.50 3.53 ± 1.32 
Chemical oxygen demand mg/L 13.62 ± 4.05 11.63 ± 3.51 10 
Ammonium mg/L 0.26 ± 0.10 0.27 ± 0.13 0.3 
Nitrate mg/L 0.85 ± 0.23 0.71 ± 0.17 
Nitrite mg/L 0.06 ± 0.04 0.055 ± 0.041 0.05 
Phosphate mg/L 0.07 ± 0.02 0.061 ± 0.012 0.1 
Coliform MNP/100 mL 1,583 ± 1,069.94 1,139.87 ± 615.95 2,500 
Iron mg/L 1.84 ± 0.72 1.483 ± 0.429 0.5 
Zinc mg/L 0.1042 ± 0.116 0.101 ± 0.005 0.5 
Copper mg/L 0.2012 ± 0.0027 0.200 ± 0.000 0.1 
Cadmium mg/L 0.0020 ± 0.00 0.0020 ± 0.00 0.005 
ParametersUnitsDry seasonRainy seasonQCVN08:A1
pH – 7.59 ± 0.20 7.44 ± 0.28 6.0–8.5 
Water temperature °C 25.49 ± 1.21 26.57 ± 0.84 – 
Total suspended solid mg/L 49.46 ± 21.59 54.52 ± 24.53 20 
Turbidity NTU 76.23 ± 51.27 77.84 ± 34.03 – 
Dissolved oxygen mg/L 6.11 ± 0.56 6.26 ± 0.55 ≥6 
Biochemical oxygen demand mg/L 3.93 ± 1.50 3.53 ± 1.32 
Chemical oxygen demand mg/L 13.62 ± 4.05 11.63 ± 3.51 10 
Ammonium mg/L 0.26 ± 0.10 0.27 ± 0.13 0.3 
Nitrate mg/L 0.85 ± 0.23 0.71 ± 0.17 
Nitrite mg/L 0.06 ± 0.04 0.055 ± 0.041 0.05 
Phosphate mg/L 0.07 ± 0.02 0.061 ± 0.012 0.1 
Coliform MNP/100 mL 1,583 ± 1,069.94 1,139.87 ± 615.95 2,500 
Iron mg/L 1.84 ± 0.72 1.483 ± 0.429 0.5 
Zinc mg/L 0.1042 ± 0.116 0.101 ± 0.005 0.5 
Copper mg/L 0.2012 ± 0.0027 0.200 ± 0.000 0.1 
Cadmium mg/L 0.0020 ± 0.00 0.0020 ± 0.00 0.005 

QCVN08:A1 = Vietnamese national technical regulation for surface water quality.

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