|
International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 12, 2015, pp. 3853-3862
|
Bioline Code: st15363
Full paper language: English
Document type: Research Article
Document available free of charge
|
|
International Journal of Environment Science and Technology, Vol. 12, No. 12, 2015, pp. 3853-3862
en |
Evaluation study of cobalt(II) and strontium(II) sorption– desorption behavior for selection of soil remediation technology
Smičiklas, I.; Dimović, S.; Jović, M.; Milenković, A. & Šljivić-Ivanović, M.
Abstract
Sorption–desorption properties of cobalt(II)
and strontium(II) ions were studied using a soil sample
from the vicinity of the Serbian radioactive waste processing
and interim storage facilities. The mobility of the
cations in the soil was evaluated and compared with the
intention to facilitate the selection of optimal remediation
strategy in case of accidental soil contamination with radioactive
cobalt-60 and strontium-90 isotopes. A systematic
sorption study was performed through a series of batch
experiments at different aging times, cation concentrations
and pH. Kinetics experiments revealed that sorbed amounts
of cobalt(II) continuously increased with contact time until
quasi-equilibrium was reached, while initial fast strontium(II) sorption was followed by a desorption step. Based
on the shapes of the sorption isotherms and calculated
sorption parameters, it was concluded that cobalt(II) sorbed
more selectively and strongly than strontium(II). Sequential
extraction showed that, regardless of the initial content
of contaminants in the soil and the aging time, high
amounts of both cations were bonded to relatively mobile
fractions: strontium(II) in the exchangeable, while cobalt(II) in the carbonate and ferromanganese oxide fraction.
Strontium(II) was readily desorbed in acidic, calcium(II)
and ethylenediaminetetraacetic acid-containing media,
whereas complexing agents such as citric and tartaric acids
at low pH were more effective reagents for cobalt(II)
desorption. The results from the present study indicate that
chemical extraction can be considered as remediation option
for strontium(II)- and cobalt(II)-contaminated soil.
Keywords
Chemical extraction; Sequential extraction; Soil pollution; Radioactive ions; Remediation
|
|
© Copyright 2015 - International Journal of Environment Science and Technology Alternative site location: http://www.ijest.org
|
|