Table 9.5
Computation of intercorrelation matrix of water quality parameters
Water quality
parameters
Intercorrelation matrix
pH
BOD
COD
Turbidity
Total
hardness Alkalinity
Ammoniacal
nitrogen
Phenolphthalein
acidity
Total
suspended
solids (SS)
Conductivity
Dissolved
oxygen
pH
1.000
À0.977 À0.971 À0.999
0.001
À0.996
À0.988
À0.945
À0.756
À0.810
0.998
BOD
À0.977
1.000
1.000
0.977
0.212
0.977
0.998
0.993
0.877
0.916
À0.962
COD
À0.971
0.999
1.000
0.971
0.240
0.971
0.996
0.996
0.891
0.927
À0.953
Turbidity
À0.990
0.977
0.971
1.000
0.001
0.998
0.988
0.945
0.756
0.810
À0.998
Total hardness
0.002
0.212
0.240
0.000
1.000
0.998
0.153
0.327
0.655
0.586
0.064
Alkalinity
À0.999
0.977
0.971
0.999
0.000
1.000
0.988
0.945
0.756
0.810
À0.998
Ammoniacal
nitrogen
À0.988
0.998
0.996
0.988
0.153
0.988
1.000
0.984
0.847
0.890
À0.976
Phenolphthalein
acidity
À0.945
0.993
0.996
0.945
0.327
0.945
0.984
1.000
0.929
0.958
À0.922
Total Suspended
solids
À0.756
0.877
0.891
0.756
0.655
0.756
0.847
0.929
1.000
0.996
À0.712
Conductivity
À0.810
0.916
0.927
0.810
0.586
0.810
0.890
0.958
0.0996
1.000
À0.771
Dissolved
oxygen
0.998
À0.962 À0.953 À0.998
0.064
À0.998
À0.976
À0.922
À0.712
À0.771
1.000
222
M. B. Roy et al.