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Table 7 Summary of the PCA loading for 24 variables

From: An application of Water Quality Index (WQI) and multivariate statistics to evaluate the water quality around Maddhapara Granite Mining Industrial Area, Dinajpur, Bangladesh

Variables Factor 1 Factor 2 Factor 3 Factor 4 Factor 5
PH 0.505140 −0.423783 −0.523819 0.281011 0.231837
Sp. conductivity 0.973220 0.078222 0.062930 −0.105619 −0.052161
Turbidity 0.027478 −0.437808 0.685626 0.218108 −0.157060
Total alkalinity 0.835965 −0.389071 −0.155823 0.100161 0.047304
Alkalinity (OH) −0.298613 −0.443572 −0.304156 0.432541 −0.020149
Alkalinity (HCO3) 0.854348 −0.365501 −0.133041 0.060517 0.052251
Total hardness 0.959257 −0.105187 0.034686 −0.051546 0.055754
Iron −0.176503 −0.311548 0.125313 0.259103 0.703320
Calcium 0.917427 −0.056955 0.121062 −0.094580 0.070455
Magnesium −0.458933 −0.356458 −0.138375 0.118694 0.520944
Sodium 0.615277 0.107953 0.049094 0.078692 0.121033
Potassium 0.871104 0.105514 0.060418 −0.269454 −0.140015
Arsenic −0.014235 0.364144 0.699425 −0.245118 −0.361498
Cadmium −0.450872 0.598943 0.040729 0.214109 0.166345
Zinc 0.722452 0.384863 −0.011331 −0.468652 0.035537
Chromium −0.029260 0.269727 0.122538 0.544966 −0.284185
Sulfate −0.302047 0.583734 0.107611 0.416829 0.057136
Phosphate −0.351122 0.592348 0.052115 0.504778 0.008429
Soluble silica −0.251729 0.252323 0.793143 0.170839 0.013400
Nitrate −0.372521 0.430667 0.393509 0.435109 −0.044675
Chloride 0.835263 0.230616 0.155028 0.033166 −0.119517
Ammonia −0.350977 −0.448496 0.129445 −0.199509 0.507021
TDS 0.973249 0.057827 0.065802 −0.112613 −0.037220
Carbonate 0.885900 −0.171159 0.147483 −0.192210 0.008697
  1. Significant factor loadings are in italics