To cite this version:Véronique Lenoble, D Omanović, Cédric Garnier, Stéphane Mounier, N Đonlagić, et al.. Distribution and chemical speciation of arsenic and heavy metals in highly contaminated waters used for health care purposes (Srebrenica, Bosnia and Herzegovina). Science of the Total Environment, Elsevier, 2013Elsevier, , 443, pp.420-428. <10.1016Elsevier, /j.scitotenv.2012 H I G H L I G H T S► Acid mine drainage type waters used for decades for healthcare purposes were analysed. ► Extremely high contents of As (up to 6.6 mg/L) and other heavy metals were registered. ► Acidic springs decreased pH of the river from 7.3 to 3.4 in only 1.5 km distance. ► Geochemical modelling revealed dominance of oxidized forms of all elements. Determination of distribution and chemical speciation of arsenic and heavy metals in five acidic springs and in the receiving river near Srebrenica (Bosnia and Herzegovina) was carried out. These waters were used for centuries, and continue to be used, for health-care purposes. The composition and properties of all springs and the river water (after all inputs) resembled that of an acid mine drainage. Very low pH (b 3.3), high sulphate concentration and extremely high contents of most of the measured elements (25) are found in all springs (e.g. arsenic and iron maximal concentration of 6.6 and 500 mg L −1 , respectively). Although of small discharge, spring waters caused the decrease of the receiving river pH (from 7.3 to 3.4) and the considerable increase of the concentrations of elements. The enrichment factor for the studied elements ranged from 1.2 for Sr up to 425 for As. In acidic spring waters, all elements were predominantly present in dissolved form. Elements associated to freshly-formed hydrous ferric oxide were prevailing in particulate forms only at the two most upstream sites in the river with pH > 7. Geochemical speciation modelling (PHREEQC and WHAM-VI) revealed that As was mainly present as As(V), and Fe as Fe(III). Complexation of dissolved metals by organic matter was predicted to be significant only for the two river sites with neutral pH. a b s t r a c t a r t i c l e i n f o
The results of investigation of inorganic and organic speciation of copper compounds in the lake Modrac, using the geochemical equilibrium model BLM (Biotic Ligand Model; USEPA 2007) and other geochemical models are presented, as well as toxicity and bioavailability of copper compounds in the lake Modrac for chosen biotic ligand of fish fathead minnow (Pimephales promelas). Speciation and bioavailability of copper complexes was investigated and toxicity levels for chosen biotic ligand determined. The influence of water chemistry on copper toxicity is predominant, and application of sophisticated BLM model enables the prediction of toxicity and bioavailability of copper.
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