Preconcentration of anionic forms of chemical elements on filters with anchored quaternary ammonium groups |
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| Authors: | T I Tikhomirova N M Sorokina O O Lashtabega D N Konshina V V Konshin Z A Temerdashev G I Tsizin |
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| Institution: | (1) Department of Analytical Chemistry, Kuban, Russia;(2) Department of Analytical Chemistry, Faculty of Chemistry, Kuban State University, Kuban, Russia |
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| Abstract: | Sorption of silicomolybdic acid (SMA) and phosphovanadomolybdic acid (PVMA) and arsenic(V), vanadium(V), and chromium(VI) anionic species is studied on cellulose filters with bound quaternary ammonium groups. These heteropoly acids (HPAs) are recovered in quantity on filters from solutions with high salt backgrounds and with high mineral acid concentrations. AsO 4 3? , CrO 4 2? , and VO 3 ? anions are sorbed at pH of 3–9. In this case, the ionic strength considerably influences anion recovery. Conditions were found for preconcentrating vanadium, arsenic, and chromium from 250-mL aliquots of aqueous solutions (the preconcentration coefficient was 5 × 103). A procedure was proposed for the sorption/X-ray fluorescence determination of these elements in high-purity water. |
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