METHODS AND OBJECTS OF CHEMICAL ANALYSIS ISSN title: "Metody i obʺekty himičeskogo analiza" An international journal devoted to all aspects of Analytical chemistry ISSN 2413-6166 (Online), ISSN 1991-0290 (Print)
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Y. I. STUDENYAK, M.V. FERSHAL, L.M. KUSHNIR.

TETRAFLUOROBORATE SELECTIVE ELEC,TRODE ON THE BASIS OF 2-(N-ETHYLCARBAZOL-3)-ETHENYL-1,3,3-TRIMETHYL-3Н-INDOLIUM

 A new PVC tetrafluoroborate selective electrode based on ion pair of tetrafluoroborate ion with styrene dye 2,(n,ethylcarbazol,3),ethenyl,1,3,3,trimethyl,3Н,indolium as the active substance has been elabo,rated. The electrode shows a near,teoretical response slope (,55±1 mV per decade) for tetrafluoroborate ion over a concentration range from 0.1 mol/l to 1.0·10⁻⁵ mol/l. The electrode shows high selectivity for BF₄¯ ions with respect to most extended anions and cations, boric acid, fluorocomplexes of metals and traditional masking agents. The response time of the electrode is 5–30 seconds and the life,time is 18 month. The EMF of the electrode doesn’t depend on pH in range 2–8 and the electrode’s response to te,trafluoroborate ions is stable in acid solutions to 6 M Н2SO4. New and simple technics for Boron determi,nation in sea, hidrothermall and other high,saline waters has been elaborated (RSD= 0.02–0.05, n=5, P=0.95).

Keywords: Tetrafluoroborate, 2-(N,ethylcarbazol-3)-ethenyl-1,3,3-trimethyl-3Н-indolium ion pair, ion-selective electrode, potentiometric sensor, boron determination, water analysis.