In situ stabilization of As and Sb with naturally occurring Mn, Al and Fe oxides in a calcareous soil: Bioaccessibility, bioavailability and speciation studies

摘要: Abstract This study investigated the effectiveness of 6 different types naturally occurring manganese, aluminum and iron oxides for stabilization As Sb in a calcareous soil spiked with 50 mg kg−1 or two dosages treatments (2% 5%). The resulting contaminated soils were subjected to series chemical extraction studies including sequential extraction, single step DTPA Simplified Bioaccessibility Extraction Test (SBET) estimation bioaccessible fraction greenhouse experiment using barley as test crop. results showed that Fe-associated carbonate-bound predominant fractions. However, amounts labile fractions higher soils, whereas percentage associated crystalline Fe-oxide residual higher. revealed application natural metal reduced SBET extractable plant uptake Sb. After amendments, exchangeable decreased dramatically by up 82% while 60% depending upon additive. extractions confirmed had lower bioavailability, compared As.