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Antimonate sorption in soils increases with ageing
Author(s) -
Verbeeck Mieke,
Thiry Yves,
Smolders Erik
Publication year - 2020
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/ejss.12845
Subject(s) - soil water , sorption , antimonate , antimony , aluminium hydroxide , hydroxide , chemistry , environmental chemistry , leaching (pedology) , aluminium , amorphous solid , soil science , adsorption , inorganic chemistry , geology , organic chemistry
It is unclear to what extent sorption of antimony (Sb) in soils occurs over long time scales. This study was set up to monitor slow reactions (7 days to 6 months) of Sb in Sb(V)‐spiked soil samples during aerobic incubation. The solid–liquid distribution coefficients ( K D ) increased by factors of 3 to 6 between 7 and 190 days after spiking, depending on the soil. This increase in the K D value, hereafter named the Sb ageing factor, increased with increasing amorphous iron and aluminium hydroxide concentration and decreasing pH of the soil samples. Finally, ageing factors were highest in topsoils and could be important in preventing Sb from migrating downwards into groundwater bodies. Highlights Quantification of antimonate ageing in soils. Topsoils could prevent downward leaching of Sb in the long‐term. Ageing of Sb increased in soils with increasing amorphous iron and aluminium hydroxide concentration and decreasing pH. Slow sorption reactions reduce Sb mobility in soils.