Cr

Cu

Pb

Zn

TOC

PH

Cr

1.000

Cu

0.629*

1.000

Pb

−0.217

−0.259

1.000

Zn

−0.004

0.015

0.960**

1.000

TOC

0.503*

0.588*

0.019

0.149

1.000

pH

−0.184

0.078

−0.041

−0.037

0.832**

1.000