caa a22 4500 463220331 CHVBK 20180405153210.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1134/S106193480705005X doi (NATIONALLICENCE)springer-10.1134/S106193480705005X Selective photometric determination of selenium in aqueous media [Elektronische Daten] [A. Bulatov, L. Moskvin, E. Rudenko, G. Koldobskii] A procedure is developed for the photometric determination of selenium in aqueous media using 2-(p-nitrophenyl)-3,5-diphenyltetrazolium chloride. To selectively determine selenium, a two-stage scheme of sample preparation is chosen. It includes the gas extraction of selenium liberated as hydrogen selenide, its extraction from the gas phase to a solution of lead nitrate by liquid absorption and repeated extraction of hydrogen selenide, followed by its absorption with an aqueous reagent solution to form water-insoluble formazan. The formazan is extracted with chloroform. The concentration of selenium is determined from the absorbance of the chloroform extract of formazan. The procedure involves no special preconcentration operations and allows from 10 to 100 μg/L selenium to be determined. Pleiades Publishing, Ltd., 2007 Bulatov A. St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russia aut Moskvin L. St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russia aut Rudenko E. St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russia aut Koldobskii G. St. Petersburg State Technological Institute, Technical University, Moskovskii pr. 26, 198013, St. Petersburg, Russia aut Journal of Analytical Chemistry Nauka/Interperiodica 62/5(2007-05-01), 424-427 1061-9348 62:5<424 2007 62 10809 https://doi.org/10.1134/S106193480705005X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S106193480705005X text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bulatov A. St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Moskvin L. St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Rudenko E. St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Koldobskii G. St. Petersburg State Technological Institute, Technical University, Moskovskii pr. 26, 198013, St. Petersburg, Russia aut NATIONALLICENCE 773 0- Journal of Analytical Chemistry Nauka/Interperiodica 62/5(2007-05-01), 424-427 1061-9348 62:5<424 2007 62 10809 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer