Table 4.

Correlation between pH, Carbonates, organic matter content, and clay percentages with contents of heavy metals (mg/kg).

Metals with fractions		pH	CO3  2−	OM	Clay
			%
Pb	Exchangeables	−0.280	0.324	0.487	0.123
	Carbonates	0.653	0.086	−0.561	−0.572
	Oxides	−0.353	−0.361	−0.235	0.183
	Organics	−0.686	0.138	0.466	0.651
	Residuals	0.141	0.282	0.077	0.096
Cu	Exchangeables	−0.223	0.558	0.221	0.246
	Carbonates	0.484	0.138	−0.348	−0.049
	Oxides	−0.331	0.268	0.530	0.278
	Organics	−0.292	0.420	0.698	0.416
	Residuals	0.408	0.085	−0.137	−0.077
Cr	Exchangeables	−0.198	0.174	0.613	0.150
	Carbonates	0.404	−0.176	−0.232	0.051
	Oxides	−0.375	−0.474	−0.037	0.251
	Organics	−0.341	0.094	0.193	0.293
	Residuals	0.243	−0.044	−0.166	−0.039
Zn	Exchangeables	−0.223	0.558	0.221	0.246
	Carbonates	0.484	0.138	−0.348	−0.049
	Oxides	−0.331	0.268	0.530	0.278
	Organics	−0.292	0.420	0.698	0.416
	Residuals	0.408	0.085	−0.137	−0.077
As	Exchangeables	−0.198	0.174	0.613	0.150
	Carbonates	0.404	−0.176	−0.232	0.051
	Oxides	−0.375	−0.474	−0.037	0.251
	Organics	−0.341	0.094	0.193	0.293
	Residuals	−0.223	0.558	0.221	0.246
Sn	Exchangables	0.484	0.138	−0.348	−0.049
	Carbonates	−0.331	0.268	0.530	0.278
	Oxides	−0.292	0.420	0.698	0.416
	Organics	0.408	0.085	−0.137	−0.077
	Residuals	−0.198	0.174	0.613	0.150