Selective photometric determination of low conentrations of selenium(IV) and selenium(VI) in bottled drinking water
- Authors: Nayanova E.V.1, Sergeev G.M.1, Elipasheva E.V.1
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Affiliations:
- Faculty of Chemistry
- Issue: Vol 71, No 4 (2016)
- Pages: 379-385
- Section: Articles
- URL: https://journals.rcsi.science/1061-9348/article/view/181629
- DOI: https://doi.org/10.1134/S1061934816040067
- ID: 181629
Cite item
Abstract
A procedure is developed for the selective photometric determination of selenium(IV) in bottled drinking water by the oxidation of Methylene Blue in 1 M HCl to colorless decomposition products and of selenium(VI) by its interaction with the specified reagent at pH 5–6 with the formation of a colored ion pair. The limits of detection are 1 and 0.8 µg/L, respectively. At the concentration of selenium(IV) 2 µg/L, the admissible weight ratios are: SeO42-, Br3- (1: 20); Br– (1: 60); I–, IO3- and IO4- (1: 100). At equal concentration of selenium(VI), the following species: SeO42-(1: 20); Br3-, Br–, I–, IO3-, and IO4- (1: 100) do not interfere with the determination. Other anions and cations present in highly mineralized waters do not interfere with the determination. The relative error of determination is 8–10% in the concentration range 2–10 µg/L of selenium(IV) and selenium(VI) and does not exceed 5% in their concentration range of 10–100 µg/L.
About the authors
E. V. Nayanova
Faculty of Chemistry
Email: GenMich@rambler.ru
Russian Federation, pr. Gagarina 23, Nizhni Novgorod, 603950
G. M. Sergeev
Faculty of Chemistry
Author for correspondence.
Email: GenMich@rambler.ru
Russian Federation, pr. Gagarina 23, Nizhni Novgorod, 603950
E. V. Elipasheva
Faculty of Chemistry
Email: GenMich@rambler.ru
Russian Federation, pr. Gagarina 23, Nizhni Novgorod, 603950