Table 8.

Fragment of the matrix of eigenvectors with four principal components (italics indicate statistically important impact)

	Component I	Component II	Component III	Component IV
Cd	− 0.490	− 0.660	0.272	− 0.483
Cr	− 0.352	− 0.716	− 0.590	0.070
Cu	− 0.876	0.183	− 0.150	− 0.105
Hg	− 0.352	− 0.716	− 0.590	0.070
Ni	− 0.605	− 0.533	0.325	0.477
Pb	− 0.912	0.230	− 0.011	− 0.011
Zn	− 0.866	0.159	0.106	0.025
Variation percentage	51.166	23.573	8.188	6.838
Total variation (%)	51.166	74.7	83	89.8