Journal of Chemistry / 2015 / Article / Tab 4

Research Article

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

Table 4

Results of sequential extraction of Cd, Pb, and Zn in soil sampled.

FractionHeavy metal (mg/kg)
CdPbZn

F1a22.5 (27.2%)e1,395 (18.6%)e1,095 (22.8%)e
F2b6.56 (7.95%)e548 (7.30%)e292 (6.06%)e
F3c15.4 (18.6%)e4,074 (54.2%)e1,710 (35.6%)e
F4d38.1 (46.2%)e1,495 (19.9%)e1,713 (35.6%)e

Acid soluble fraction (soluble and exchangeable fraction and bound to carbonates).
bReducible fraction (bound to Fe/Mn oxides).
cOxidizable fraction (bound to organic matter and sulfides).
dResidual fraction (aqua regia).
eThe values in parentheses are ratio of each extract to sum of each extraction.