Table 5.

Correlation coefficient among different metals in topsoils around industrial sites in Dongguan.

Elements	Hg	As	Pb	Cu	Zn	Ni	Cr
As	−0.069	1
Pb	0.221	0.257	1
Cu	0.199	0.101	0.523 **	1
Zn	0.119	−0.043	0.395 **	0.637 **	1
Ni	0.264	−0.234	0.348 *	0.520 **	0.455 **	1
Cr	0.089	0.043	0.183	0.033	−0.089	0.185	1
Cd	0.245	−0.011	0.062	0.076	0.087	0.261	0.121

* Correlation is significant at the 0.05 level (2-tailed); ** Correlation is significant at the 0.01 level (2-tailed).