TY - JOUR
T1 - In situ stabilization of As and Sb with naturally occurring Mn, Al and Fe oxides in a calcareous soil
T2 - Bioaccessibility, bioavailability and speciation studies
AU - Bagherifam, Saeed
AU - Lakzian, Amir
AU - Fotovat, Amir
AU - Khorasani, Reza
AU - Komarneni, Sridhar
N1 - Funding Information:
The senior author, Saeed Bagherifam, gratefully acknowledges the financial support provided by Ferdowsi University of Mashhad and Ministry of Science, Research and Technology of Iran to conduct some parts of his PhD thesis as visiting scholar at Material Research Lab, The Pennsylvania State University, USA.
PY - 2014/5/30
Y1 - 2014/5/30
N2 - This study investigated the effectiveness of 6 different types of naturally occurring manganese, aluminum and iron oxides for stabilization of As and Sb in a calcareous soil spiked with 50mgkg-1 of As or Sb and two dosages of treatments (2% and 5%). The resulting contaminated soils were subjected to a series of chemical extraction studies including sequential extraction, single step extraction with DTPA and Simplified Bioaccessibility Extraction Test (SBET) for estimation of bioaccessible fraction of As and Sb in soil and a greenhouse experiment using barley as the test crop. The results showed that Fe-associated and carbonate-bound fraction of As and Sb were predominant fractions. However, the amounts of labile fractions were higher in As contaminated soils, whereas the percentage of Sb associated with crystalline Fe-oxide and residual fractions were higher. The results revealed that application of natural metal oxides reduced DTPA and SBET extractable amounts and plant uptake of As and Sb. After application of amendments, the exchangeable fraction of As decreased dramatically by up to 82% while Sb exchangeable fraction decreased by up to 60% depending upon the additive. The results of chemical extractions and plant uptake confirmed that Sb had lower bioavailability, compared with As.
AB - This study investigated the effectiveness of 6 different types of naturally occurring manganese, aluminum and iron oxides for stabilization of As and Sb in a calcareous soil spiked with 50mgkg-1 of As or Sb and two dosages of treatments (2% and 5%). The resulting contaminated soils were subjected to a series of chemical extraction studies including sequential extraction, single step extraction with DTPA and Simplified Bioaccessibility Extraction Test (SBET) for estimation of bioaccessible fraction of As and Sb in soil and a greenhouse experiment using barley as the test crop. The results showed that Fe-associated and carbonate-bound fraction of As and Sb were predominant fractions. However, the amounts of labile fractions were higher in As contaminated soils, whereas the percentage of Sb associated with crystalline Fe-oxide and residual fractions were higher. The results revealed that application of natural metal oxides reduced DTPA and SBET extractable amounts and plant uptake of As and Sb. After application of amendments, the exchangeable fraction of As decreased dramatically by up to 82% while Sb exchangeable fraction decreased by up to 60% depending upon the additive. The results of chemical extractions and plant uptake confirmed that Sb had lower bioavailability, compared with As.
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U2 - 10.1016/j.jhazmat.2014.03.054
DO - 10.1016/j.jhazmat.2014.03.054
M3 - Article
C2 - 24751490
AN - SCOPUS:84898825452
SN - 0304-3894
VL - 273
SP - 247
EP - 252
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -