%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Ferrari, C.
%A Resongles, Eléonore
%A Freydier, R.
%A Flores, M.
%A Ormachea, M.
%A Echenique, G. Z.
%A Casiot, C.
%T Deciphering Sb sources and transport processes in a mining and smelting-impacted river system (Oruro, Bolivia) : insights from Sb isotopes
%D 2025
%L fdi:010094868
%G ENG
%J Water Air and Soil Pollution
%@ 0049-6979
%K Antimony isotopes ; Antimony isotope fractionation ; Mining and metallurgy pollution ; River contamination ; Mining waters ; Mine wastes
%K BOLIVIE ; ORURO
%M ISI:001547226500001
%N 12
%P 790 [20 ]
%R 10.1007/s11270-025-08445-6
%U https://www.documentation.ird.fr/hor/fdi:010094868
%> https://www.documentation.ird.fr/intranet/publi/2025-09/010094868.pdf
%V 236
%W Horizon (IRD)
%X Antimony (Sb) is a contaminant of increasing concern; its sources and fate in the environment require particular attention and its isotopes could be useful geochemical tracers. In this study, Sb isotopic composition was investigated along two rivers impacted by mining and smelting activities in the city of Oruro (Bolivia). Antimony concentration and isotope ratio were measured in water, suspended particulate matter and sediments during two contrasted seasons along a gradient of pH (from 1.6 to 6.5) and Sb concentration (from 8057 to 7 mu g.L-1). Antimony isotopic composition varied over a range of similar to 1 parts per thousand considering all sample types (-0.09 <= delta Sb-123 <= + 0.93 parts per thousand). The main stream impacted by acid mine drainage showed a progressive increase of delta Sb-123 in the dissolved phase (+ 0.42 to + 0.70 parts per thousand), concomitant to Fe precipitation and Sb concentration decrease. This suggested that natural Sb attenuation by sorption onto neoformed Fe oxyhydroxysulphates was involved as this process favours light isotopes in the solid (Delta Sb-123(water-sediments) averaged + 0.3 parts per thousand). Smelting-impacted tributary exhibited lighter dissolved Sb (+ 0.29 <= delta Sb-123 <= + 0.36 parts per thousand). Lake Uru-Uru which receives both rivers exhibited a delta Sb-123 value of + 0.28 parts per thousand in the wet season and + 0.55 parts per thousand in the dry season, which might reflect different contributions of the AMD- and smelter-impacted rivers. The study reveals, for the first time, the impact of two distinct anthropogenic sources on antimony (Sb) isotopic composition on a water body and provides new insights into the ability of antimony isotopes to trace sources and processes in contaminated aquatic systems.
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