Table 2.

Results of Principal Component Analysis (PCA).

Metals	PC 1	PC 2	PC 3	PC 4
Zn	0.47	−0.01	0.87	0.12
Pb	0.33	0.83	−0.22	0.39
Cd	0.64	0.02	−0.25	−0.73
Cu	0.51	−0.56	−0.36	0.55
Eigenvalue	1.96	1.02	0.73	0.29
% variance	48.98	25.61	18.24	7.17
Cumulative	49.63%	74.64%	93.03%	100.00%

Bolded values indicated that eigen values > 0.6.