Abstract
An extract of crystal violet-tetrachloroferrate(III)in nitrobenzene was used to prepare a tetrachloroferrate(II)()-selective liquid membrane electrode with a poly(vinyl chloride) support. The optimal conditions to determine 2.5 x 10 -5- 5.0 x 10-2M iron(III) as tetrachloroferrate(III) (anionic slope 56 mV/decade, detection limit 7.9 x 10-6M) were found to be 4.0-5.5. M total chloride in 0.75 1.5 M hydrochloric acid. The electrode was reliably applied to determine iron in human blood, haematite and mineralized vitamin syrup by direct potentiometry, standard and sample additions as well as standard subtrac- tion techniques.
Published Version
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