Table 2.

Correlation coefficient (r) of trace elements in soils (n = 117).

Elements	Cu	Zn	Pb	Cd	As
Cu	1.000
Zn	0.749	1.000
Pb	0.640	0.878	1.000
Cd	0.727	0.816	0.751	1.000
As	0.718	0.600	0.432	0.602	1.000

Note: Bold r-values are significant at p < 0.01 level.