olid p ase e traction of c romiun t allium and arsenic using modified wit as ... As, Tl and Cr belong to a group of potentially very toxic elements. The cations As(III), Cr(III), and Tl(III) have some similar chemical properties and can react with ...
COST Action TD 1407
Workshop on Environmental Concentrations, Cycling & Modeling of Technology Critical Elements
January 18-19, 2017
The David Lopatie Conference Center Weizmann Institute of Science
ABSTRACT BOOK
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Supported by The Chorafas Institute for Scientific Exchange
olid p ase e traction of c romiun t allium and arsenic using modified wit sorbent N. Ospina-‐Alvarez , E. iadu , . Krasnodebska-‐Ostrega
as
University of Potsdam, Institute of Earth and Environmental Sciences. Potsdam, ermany University of arsaw, Faculty of Chemistry. arsaw, Poland As, Tl and Cr belong to a group of potentially very toxic elements. The cations As(III), Cr(III), and Tl(III) have some similar chemical properties and can react with dithiocarbamates ( TCs). Application of diethylenodithiocarbamate ( TC) in speciation analysis of Tl(III) is very promising , but for use of TCs molecules in simultaneous separation and pre-‐concentration of the Me(III) from a water matrix, it is required the use of another compound. The solubility of the complexes of trivalent ions with ammonium pyrrolidinedithiocarbamate (AP C) are much lower than with TC. Therefore, AP C was proposed for simultaneously precipitation of Me(III)AP C (Me As(III), Tl(III) and Cr(III)). As, Tl and Cr compounds with TCs can be selectively separated in water samples and soil extracts using solid phase extraction (SPE). SPE have been applied for years, but becomes more and more popular due to the small cost of SPE-‐chambers and easiness of application. The separation of matrix could be performed in mode off-‐line as well as on-‐line SPE The aim of this study was to develop a method for separation of As(III) As( ), Cr(III) Cr( I) and Tl(I) Tl(III) in water samples on a SPE column. Octadecyl silica gel (S C ) modified with ammonium pyrrolidinedithiocarbamate (AP C) was applied as sorbent. The method is based on the differences in chelation of metals on different oxidation states and AP C depending on the selected conditions, especially pH. Cr(III), As(III), Tl(I) and Tl(III) can precipitate with AP C in acetic acid solution (pH ) . ased on literature data, ions As(III), Tl(III) and Cr(III) should be retained on the sorbent as complexes with AP C. The sorbent should be leached using organic solvent, according to hydrophobic properties of the compounds. In turn, ions of As( ), Tl(I) and Cr( I) are unstable in nitric acid solution and using this acid should lead to leaching of the species of the studied elements. After SPE, using S C modified with AP C as sorbent, the content of analyte in the eluent was determined by inductively coupled plasma mass spectrometry (ICP MS). Complex Tl(I)AP C ( recovery) is much better eluted from the sorbent using . mol -‐ HNO than Tl(III)AP C, which was leached in next step ( recovery). oth forms of Cr -‐ Cr (III) and Cr ( I) were retained on the S C column modified with AP C. Cr(III) was retained on the sorbent, but more than passed to the filtrate. The best results were obtained for arsenic without the final elution with EtOH at step . At the step , As(III) was retained on the column ( ), while only of As( ) was retained. References Krasnod bska-‐Ostr ga, . Sadowska, M. Piotrowska, K. o da, M. ( ). Thallium (III) determination in altic seawater samples by ICP MS after preconcentration on S C modified with TC. Talanta, , -‐ . Hulanicki, A. ( ). Compexation reaktions of dithiocarbamates. Talanta, , –
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