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Two principal components have been defined as best descriptors of the variability of chemical composition of the groundwater samples under study. These express about 72% of the variance as indicated in Table 2.

Table 2

Total variance explained

ComponentInitial eigenvalues
Extraction sums of squared loadings
Total% of varianceCumulative %Total% of varianceCumulative %
4.485 56.067 56.067 4.485 56.067 56.067 
1.266 15.825 71.892 1.266 15.825 71.892 
0.952 11.903 83.795    
0.646 8.080 91.876    
0.445 5.560 97.436    
0.203 2.537 99.973    
0.002 0.026 100.000    
8.275 × 10−6 0.000 100.000    
ComponentInitial eigenvalues
Extraction sums of squared loadings
Total% of varianceCumulative %Total% of varianceCumulative %
4.485 56.067 56.067 4.485 56.067 56.067 
1.266 15.825 71.892 1.266 15.825 71.892 
0.952 11.903 83.795    
0.646 8.080 91.876    
0.445 5.560 97.436    
0.203 2.537 99.973    
0.002 0.026 100.000    
8.275 × 10−6 0.000 100.000    

Extraction method = Principal component analysis.

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