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Table 2 Chemical properties of soil and contents of Cd and Pb in soil aggregates

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 Macro-aggregates Micro-aggregates Silt Colloid
pH 6.5b ± 0.7 6.6b ± 0.6 7.1ab ± 0.5 7.9a ± 0.5
Organic matter (g/kg) 22.0a ± 9.3 16.5a ± 10.1 25.1a ± 10.6 40.6a ± 18.3
CEC (c mol/L) 10.4a ± 2.4 10.8a ± 2.2 16.5a ± 2.9 52.1a ± 40.1
Free iron oxide (mg/kg) 36.6b ± 15.2 55.3b ± 19.2 96.2b ± 45.1 1265.3a ± 742.3
Phosphorus (g/kg) 1.5a ± 0.5 0.7b ± 0.5 1.0b ± 0.4 1.4a ± 0.3
Total Cd (mg/kg) 6.5b ± 3.2 3.8b ± 2.0 4.6b ± 3.1 96.2a ± 68.3
Available Cd (mg/kg) 1.2b ± 1.1 1.2b ± 1.2 1.6b ± 2.2 60.2a ± 45.2
Total Pb (mg/kg) 765.2b ± 986.4 469.5b ± 568.2 530.9b ± 650.4 6059.2a ± 10624.2
Available Pb (mg/kg) 90.3b ± 70.3 99.6b ± 103.3 68.3b ± 96.2 433.2a ± 605.2
  1. Using single factor analysis of variance and multiple comparison, different alphabets (a, b) means the value of the data has significant difference at the 5% levels, the same alphabet of the data has no significant difference in statistics