Liquid-state membrane electrode sensitive to bismuth(III).
A liquid ion-exchange electrode containing a tetrachloraethane solution of the complex of bismuth(III) with 5-mercapto-3-(naphthyl-1)-1,3,4-thiadiazol-2-thione is described. The electrode is sensitive to Bi(3+). The slope of the calibration graph (electrode potential vs. concentration) is 18.7 mV pBi in the pBi range 6.5-9.5 in ammonium acetate buffer (pH = 4.0). Bivalent cations and Al(III), Fe(III) and Th(IV) do not interfere (K(Bi(3+)+,(M(2+)))<10(-5)). The dissociation constant of bismuth acetate has been determined with the aid of the electrode.
Szczepaniak
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Faculty of Chemistry, A. Mickiewicz University, 60-780 Poznań, ul. Grunwaldzka 6, Poland.
Ren
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