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Table 3

The statistics of the water quality indexes of the inland water system

ParameterNumber of sampleMaximumMinimumMeanOver standard rate (%)Maximum exceeding standard multipleAverage exceeding standard multipleStandard deviation (SD)Coefficient of variation (CV) (%)
pH 408 8.95 6.0 7.07 0 / / 0.46 6.6 
DO 408 8.7 3.4 6.0 0 / / 0.77 12.8 
CODMn 408 86.3 0.003 10.6 41.9 7.63 0.06 6.97 65.8 
CODCr 408 299 12 36 49.3 8.97 0.20 23.79 66.1 
BOD5 408 49.2 1.6 8.8 64.5 7.2 0.44 5.64 65.0 
NH3-N 408 29.9 0.1 5.1 78.2 18.9 2.38 4.67 91.9 
TP 408 9.8 0.11 0.96 91.9 31.7 2.21 0.93 97.0 
Fluoride (F−) 408 7.31 0.21 1.03 9.8 3.87 −0.32 0.56 54.6 
Volatile phenol 408 0.05 0.0007 0.003 0.49 4.13 −0.67 0.003 87.7 
Petroleum 408 0.71 0.005 0.06 0.25 0.42 −0.8 0.05 83.6 
Sulfide 408 0.087 0.0025 0.018 0 −0.83 −0.96 0.01 74.5 
ParameterNumber of sampleMaximumMinimumMeanOver standard rate (%)Maximum exceeding standard multipleAverage exceeding standard multipleStandard deviation (SD)Coefficient of variation (CV) (%)
pH 408 8.95 6.0 7.07 0 / / 0.46 6.6 
DO 408 8.7 3.4 6.0 0 / / 0.77 12.8 
CODMn 408 86.3 0.003 10.6 41.9 7.63 0.06 6.97 65.8 
CODCr 408 299 12 36 49.3 8.97 0.20 23.79 66.1 
BOD5 408 49.2 1.6 8.8 64.5 7.2 0.44 5.64 65.0 
NH3-N 408 29.9 0.1 5.1 78.2 18.9 2.38 4.67 91.9 
TP 408 9.8 0.11 0.96 91.9 31.7 2.21 0.93 97.0 
Fluoride (F−) 408 7.31 0.21 1.03 9.8 3.87 −0.32 0.56 54.6 
Volatile phenol 408 0.05 0.0007 0.003 0.49 4.13 −0.67 0.003 87.7 
Petroleum 408 0.71 0.005 0.06 0.25 0.42 −0.8 0.05 83.6 
Sulfide 408 0.087 0.0025 0.018 0 −0.83 −0.96 0.01 74.5 
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