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Based on the Kaiser criterion only two PCs can be retained and have eigenvalues greater than 1 (Kaiser 1958). However, after a number of tests, three PCs were extracted explaining 84% of the total variance in the data set (Table 1).

Table 1

PC loadings and explained variance for three components with Varimax rotation

ParameterPC1PC2PC3
Ca2+ 0.168 0.650 0.667 
Mg2+ 0.524 0.625 0.428 
Na+ 0.916 0.104 0.182 
K+ 0.824 0.139 0.123 
HCO3 0.007 0.933 −0.139 
Cl 0.783 −0.001 0.381 
SO42− 0.331 −0.099 0.878 
Eigenvalue 3.69 1.40 0.79 
Explained variance (%) 52.67 20.10 11.30 
Cumulative % of variance 52.67 72.72 83.98 
ParameterPC1PC2PC3
Ca2+ 0.168 0.650 0.667 
Mg2+ 0.524 0.625 0.428 
Na+ 0.916 0.104 0.182 
K+ 0.824 0.139 0.123 
HCO3 0.007 0.933 −0.139 
Cl 0.783 −0.001 0.381 
SO42− 0.331 −0.099 0.878 
Eigenvalue 3.69 1.40 0.79 
Explained variance (%) 52.67 20.10 11.30 
Cumulative % of variance 52.67 72.72 83.98 

Variables with PC loadings greater than 0.6 are considered to be significant and are marked in bold.

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