TETRACHLOROFERRATE(III)-SELECTIVE LIQUID MEMBRANE-ELECTRODE BASED ON CRYSTAL VIOLET

An extract of crystal violet-tetrachloroferrate(III) in nitrobenzene w as used to prepare a tetrachloroferrate(III)-selective liquid membrane electrode with a poly(vinyl chloride) support. The optimal conditions to determine 2.5 x 10(-5) - 5.0 x 10(-2) M iron(III) as tetrachlorofe rrate(III) (anionic slope 56 mV/decade, detection limit 7.9 x 10(-6) M ) were found to be 4.0 - 5.5. M total chloride in 0.75 - 1.5 M hydroch loric acid. The electrode was reliably applied to determine iron in hu man blood, haematite and mineralized vitamin syrup by direct potentiom etry, standard and sample additions as well as standard subtraction te chniques.