caa a22 4500 463220579 CHVBK 20180405153210.0 cr unu---uuuuu 170326e20070201xx s 000 0 eng 10.1134/S1061934807020165 doi (NATIONALLICENCE)springer-10.1134/S1061934807020165 A visual test method for determining selenium(IV) with indigocarmine immobilized on silica [Elektronische Daten] [O. Zaporozhets, S. Bilokon] A solid reagent based on silica successively modified by quaternary ammonium salt and indigocarmine is proposed for the test determination of selenium(IV). The detection limit for selenium is found to be 10 μg/L using catalytic reaction of the reduction of immobilized indigocarmine by sulfide as an indicator reaction. The calibration graph is linear in the range of selenium concentrations from 50 to 400 μg/L. Alkali and alkaline-earth metals, NH 4 + , Cl−, NO 3 − , and SO 4 2− do not interfere with the determination of selenium. The interference from heavy metals is eliminated by introducing EDTA. The procedure was tested in determining selenium in preparations of vitamins and biologically active supplement. Pleiades Publishing, Ltd., 2007 Zaporozhets O. Department of Chemistry, Kiev National University, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut Bilokon S. Department of Chemistry, Kiev National University, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut Journal of Analytical Chemistry Nauka/Interperiodica 62/2(2007-02-01), 188-192 1061-9348 62:2<188 2007 62 10809 https://doi.org/10.1134/S1061934807020165 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061934807020165 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zaporozhets O. Department of Chemistry, Kiev National University, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut NATIONALLICENCE 700 1- Bilokon S. Department of Chemistry, Kiev National University, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut NATIONALLICENCE 773 0- Journal of Analytical Chemistry Nauka/Interperiodica 62/2(2007-02-01), 188-192 1061-9348 62:2<188 2007 62 10809 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer