TY - JOUR ID - 24246 TI - Neutralization of arsenic pollutants, contained in natural waters: The theoretical analysis of solubility of some arsenates and optimization of the processes JO - Journal of Water and Environmental Nanotechnology JA - JWENT LA - en SN - 2476-7204 AU - Litynska, Marta AU - Tolstopalova, Nataliia AU - Astrelin, Igor AD - National Technical University of Ukraine, Kyiv Polytechnic Institute, 37 Peremohy prosp, Kyiv, Ukraine Y1 - 2017 PY - 2017 VL - 2 IS - 1 SP - 1 EP - 8 KW - Solubility KW - Equilibrium Concentration KW - Iron(III) Arsenate KW - Aluminium Arsenate KW - Manganese(II) Arsenate KW - Calcium Arsenate DO - 10.7508/jwent.2017.01.001 N2 - Arsenic belongs to chemical elements, which are often found in natural waters and make it unsuitable for consumption without special treatment. Neutralization of arsenic pollutants of natural waters by converting them into insoluble form is one of the perspective methods of dearsenication. Precipitation (by iron or aluminium coagulants, lime) and adsorption (by oxides and hydroxides of iron, aluminium or manganese) are among the most popular dearsenication methods. The use of these chemicals entails the formation of poorly soluble arsenates. Since the possibility of the release of arsenic compounds into the water due to the dissolution of formed arsenates depends on its solubility under appropriate conditions, it is necessary to have information about the dependence of arsenates solubility on pH. According to the calculations the solubilities of arsenates of iron(III), aluminium, manganese(II) and calcium are highly dependent on pH. At pH<4, the solubilities of these arsenates increase in the sequence FeAsO4 – Mn3(AsO4)2 – AlAsO4 – Ca3(AsO4)2. Above рН 4 dependence changes and solubilities of these arsenates increase in the sequence FeAsO4 – AlAsO4 – Mn3(AsO4)2 – Ca3(AsO4)2. UR - https://www.jwent.net/article_24246.html L1 - https://www.jwent.net/article_24246_35d10f438c9004c2a880de94a9885844.pdf ER -