HMs PC1 PC2
Cu 0.088 0.930
Zn 0.209 0.713
Pb 0.894 0.327
Cd 0.840 0.322
As 0.924 0.036
Hg 0.756 0.433
Cr 0.417 0.625
Ni 0.626 0.656
Original eigenvalue 4.96 1.19
Variance contribution rate 44.35 32.43
Cumulative contribution rate 44.35 76.78