Spatial/Temporal Characterization and Risk Assessment of Trace Metals in Mangla Reservoir, Pakistan

Table 4

Principal component loadings for trace metals in surface water of Mangla Lake.

	PC1	PC2	PC3	PC4
Eigenvalue	1.85	1.47	1.23	1.22
Total variance (%)	38.6	20.4	15.7	10.6
Cumulative variance (%)	38.6	59.0	74.7	85.3
Cd	0.83	—	—	—
Co	0.83	—	—	—
Cr	—	0.83	—	—
Cu	—	0.35	0.67	0.25
Fe	0.29	—	—	0.67
Mn	—	—	—	0.61
Ni	0.26	0.67	—	—
Pb	—	0.73	—	—
Zn	—	0.33	0.69	—

PC loadings 0.25 are omitted.