M. Verbeeck, R. Warrinnier, J. Gustafsson
May 1, 2019
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Journal
Applied Geochemistry
Abstract
Abstract The role of organic matter (OM) in antimonate (further denoted as Sb(OH)6) mobility in soil is unclear. The objective of this study was to evaluate Sb(OH)6–OM interaction. Antimonate solid:liquid distribution coefficients (KD) were measured at low Sb concentrations in soil samples with a natural gradient in soil organic carbon (OC) that were collected from different depths of up to 3 m in two excavated soil profiles and in a subset of four soil samples with experimentally increased OM concentration from addition of Suwannee River OM. The KD values were related to soil properties by multiple linear regression and described with the CD–MUSIC model of ferrihydrite. The KD values ranged from 12 to 2800 L kg−1 and decreased strongly with increasing OC concentrations, when normalized to the amount of iron (Fe) and aluminium (Al) in acid oxalate extracts (r = −0.69; p