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Table 1 Properties of studied soil samples

From: Effects of soil properties and biosurfactant on the behavior of PAHs in soil-water systems

Property Under plant Ditch
pH(CaCl2) 6.96 7.02
Organic matter 8.65 4.3
C:N ratio 12.55 8.98
Cation exchange capacity (cmol/kg) 29.34 38.79
Coarse sand >0.25 mm (%) 14.5 2.4
Fine sand 0.25–0.02 (%) 42.5 35.6
Silt 0.02–0.002 mm (%) 15 25
Clay < 0.002 mm (%) 28 37
Classificationa Sand loam Clay loam
Clay mineralogy (% wt) Smectite 6.2 7.8
  Illites 9.3 9.6
  Kaolinite 2.4 2.9
  Quartz 54.8 42.7
  Potash feldspar 13.5 23.6
  Plagioclase 10.4 9.7
  Amphibole 1.7 1.7
  Calcite 1.7 1.2
  1. aInternational classification system.