Using Spatial Regression to Model Potentially Toxic Metal (PTM) Mobility Based on Physicochemical Soil Properties

Table 3

Spearman’s rho correlation coefficients for soil properties and PTM concentrations (). Significant correlations are marked with or .

Variables	Moisture content (%)	BD (g/cm^3)	pH	CEC (meq/100 g)	Sand (%)	Silt (%)	Zn (mg/kg)	Mn (mg/kg)	Cu (mg/kg)	Pb (mg/kg)
Soil properties
BD	0.309	1
pH	0.364	—	1
CEC	—	—	—	1
TOC	0.278	−0.571	—	0.341
Sand	0.457	0.375	0.488	0.409	1
Silt	−0.459	−0.362	−0.531	−0.450	−0.979	1
Clay	—	—	—	—	−0.640	0.515
Metal concentrations
Zn	—	—	0.445	—	—	—	1
Mn	—	—	0.400	—	0.343	−0.388	0.430	1
Cu	0.319	—	0.543	—	0.556	−0.593	0.435	0.521	1
Pb	—	—	0.546	—	0.442	−0.471	0.415	0.337	0.750	1
Cd	0.296	—	0.523	—	0.318	−0.379	0.379	—	0.557	0.504