Table 5.

Principal component analysis results of metals.

Metals	PC 1	PC 2
Hg	0.991	0.046
Pb	0.990	0.040
Mn	0.965	0.124
Ni	0.955	0.143
Cu	0.943	0.090
As	0.894	0.304
Cd	0.107	0.908
Zn	0.101	0.894
Characteristic root	5.515	1.764
Percentage of total variance	68.941	22.051
Cumulative contribution rate	68.941	90.992

Used the rotated component matrix. PC, principal component.