Skip to main content

Table 3 Correlations between the chemical fractions of cadmium and lead and the soil properties

From: Distribution characteristics of cadmium and lead in particle size fractions of farmland soils in a lead–zinc mine area in Southwest China

Heavy metals Chemical fractions pH Organic matter (g/kg) CEC (mol/kg) Free iron oxide (mg/kg) Phosphorus (g/kg)
Cd EXC − 0.302** − 0.058 − 0.031 0.066 − 0.236**
CA − 0.133 − 0.098 − 0.015 − 0.017 − 0.042
R2O3 0.058 − 0.052 − 0.105 − 0.133 − 0.272**
OM − 0.062 − 0.112 0.085 0.052 0.175*
RES 0.182* 0.096 0.058 0.029 0.218**
Pb EXC 0.133 0.209* 0.507** 0.609** 0.232**
CA 0.076 − 0.063 0.067 0.006 − 0.152
R2O3 − 0.039 − 0.032 − 0.178* − 0.240** − 0.348**
OM − 0.255** − 0.066 − 0.075 − 0.118 0.018
RES − 0.023 − 0.402 − 0.158 − 0.132 0.166*
  1. EXC, exchangeable fraction; CA, carbonate-bound fraction; R2O3, Fe–Mn oxide-bound fraction; OM, organic matter-bound fraction; RES, residue fraction
  2. * P < 0.05, correlation
  3. ** P < 0.01, significantly correlation; n = 180