Table 6.

Pearson’s correlation coefficients between heavy metals in sewage sludge.

	Cd	Cr	Cu	Ni	Pb	Zn	Hg
Cd	1.0000
Cr	0.9098	1.0000
Cu	0.9823	0.8430	1.0000
Ni	0.9287	0.7703	0.9780	1.0000
Pb	0.9825	0.8811	0.9925	0.9752	1.0000
Zn	0.9716	0.9245	0.9359	0.8767	0.9579	1.0000
Hg	0.5109	0.6440	0.4734	0.4937	0.5534	0.5940	1.0000

Bold—significant correlations at p < 0.05.