Immobilization of Cd, Zn, and Pb from Soil Treated by Limestone with Variation of pH Using a Column Test

Table 3

Physicochemical properties and total heavy metal content of the soil used in this study.

Parameter	Value^4
pH	7.3 ± 0.3
Av. P2O5 (mg/kg)^1	546 ± 35.8
Exch. cation (cmol/kg)^2
Ca^2+	4.09 ± 0.78
Mg^2+	0.84 ± 0.15
K^+	0.37 ± 0.05
Soil texture (%)
Sand	40
Silt	58
Clay	2
Metals (mg/kg)^3
Cd	90.8 ± 4.52
Pb	8,058 ± 105
Zn	5,196 ± 112

Available phosphate.
²Exchangeable cation.
³The total heavy metal content was digested via aqua regia according to the standard method of soil pollution. The soil quality standards of Cd, Pb, and Zn in South Korea are 4, 200, and 300 mg/kg, respectively.
⁴The figures are the averages and standard deviations of three replicates.