Continuous-flow leaching in a rotating coiled column for studies on the mobility of toxic elements in dust samples collected near a metallurgic plant Petr S. Fedotov a, b , Mikhail S. Ermolin a, b, * , Alexandr I. Ivaneev a , Natalia N. Fedyunina a , Vasily K. Karandashev a, c , Yury G. Tatsy b a National University of Science and Technology “MISiS”, 4 Leninsky Prospect, Moscow 119049, Russia b Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences,19 Kosygin Street, Moscow 119991, Russia c The Institute of Microelectronics Technology and High-Purity Materials, Russian Academy of Sciences, 6 Institution Street, Chernogolovka 142432, Russia highlights graphical abstract  Dynamic leaching was applied to studies on the mobility of toxic ele- ments in dust.  Atmospherically deposited dust samples collected near a copper smelter were studied.  Water and simulated “acid rain” were used as eluents.  Up to 1.5, 4.1, 1.9, 11, and 46% of Pb, As, Cu, Zn, and S can be mobilized by water.  Simulated acid rain results in higher recoveries of elements, except Cu and Pb. article info Article history: Received 22 October 2015 Received in revised form 26 November 2015 Accepted 30 November 2015 Available online xxx Handling editor: Ralf Ebinghaus Keywords: Atmospherically deposited dust Copper smelter emissions Toxic elements Dynamic leaching Rotating coiled column Acid rain abstract Continuous-flow (dynamic) leaching in a rotating coiled column has been applied to studies on the mobility of Zn, Cd, Cu, Pb, Ni, Sb, As, S, and other potentially toxic elements in atmospherically deposited dust samples collected near a large copper smelter (Chelyabinsk region, Russia). Water and simulated “acid rain” (pH 4) were used as eluents. The technique enables not only the fast and efficient leaching of elements but as well time-resolved studies on the mobilization of heavy metals, sulphur, and arsenic in environmentally relevant forms to be made. It is shown that up to 1.5, 4.1,1.9,11.1, and 46.1% of Pb, As, Cu, Zn, and S, correspondingly, can be easily mobilized by water. Taking into consideration that the total concentrations of these elements in the samples under investigation are surprisingly high and vary in the range from 2.7 g/kg (for arsenic) to 15.5 g/kg (for sulphur), the environmental impact of the dust may be dramatic. The simulated acid rain results in somewhat higher recoveries of elements, except Cu and Pb. The proposed approach and the data obtained can very useful for the risk assessment related to the mobility of potentially toxic elements and their inclusion in the biogeochemical cycle. © 2015 Elsevier Ltd. All rights reserved. 1. Introduction The industrial development in the South Ural, Russia has caused a tremendous damage to the environment. A large contaminated * Corresponding author. National University of Science and Technology “MISiS”,4 Leninsky Prospect, Moscow 119049, Russia. E-mail addresses: ermolin@geokhi.ru, mihail.ermolin@gmail.com (M.S. Ermolin). Contents lists available at ScienceDirect Chemosphere journal homepage: www.elsevier.com/locate/chemosphere http://dx.doi.org/10.1016/j.chemosphere.2015.11.124 0045-6535/© 2015 Elsevier Ltd. All rights reserved. Chemosphere 146 (2016) 371e378