Table 4 Principal component loadings of heavy metals in acid extract of sediments during summer and winter

Eigenvalue

2.530

1.664

3.576

1.065

Percentage of total variance

36.14

23.77

51.09

15.22

Percentage of cumulative variance

36.14

59.91

51.09

66.30

Cd

0.131

0.733

0.506

−0.139

Cr

0.284

0.666

0.838

−0.015

Cu

0.914

0.144

0.884

0.179

Fe

0.800

−0.108

−0.035

0.951

Mn

0.913

0.020

0.835

0.140

Pb

−0.179

0.714

0.557

0.388

Zn

−0.273

0.393

0.876

0.011