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.

Article of the Year Award: Outstanding research contributions of 2020, as selected by our Chief Editors. Read the winning articles.