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Table 1 Chemical properties of soil and contents of Cd and Pb at 0–20, 20–40 and 40–60 cm depths

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

Chemical property Soil depth
0–20 cm 20–40 cm 40–60 cm
pH 6.3 ± 0.9 6.6 ± 0.9 6.6 ± 0.9
Organic matter (g/kg) 28.9 ± 9.5 18.3 ± 7.3 15.3 ± 10.2
CEC (c mol/kg) 10.3 ± 3.3 9.9 ± 2.5 10.2 ± 3.5
Free iron oxide (mg/kg) 62.5 ± 25.2 53.6 ± 14.0 55.5 ± 16.3
Phosphorus (g/kg) 1.8 ± 0.5 1.6 ± 0.5 1.7 ± 0.5
Total Cd (mg/kg) 2.7 ± 1.1 2.3 ± 1.7 2.0 ± 1.1
Available Cd (mg/kg) 0.9 ± 0.6 0.7 ± 0.8 0.5 ± 0.2
Total Pb (mg/kg) 366.1 ± 388.5 401.1 ± 695.3 366.2 ± 523.0
Available Pb (mg/kg) 90.6 ± 78.6 85.3 ± 72.6 55.2 ± 61.2