Temachwroferrate(iii) - Selective Liquid Membhane Electrode Based On Crystal Violet - Studies And Applications.

A 7xW-4 M Crystal Violet tetrachloroferrate(III) extract inrnnitrobenzene has been used to construct tetrachlol~}ferrate(III)-selectivernliquid IllEITbrane electrode with a PVC support. The electrode body wasrnmade fran too concentric Pyrex glass tubes (lengths 120 mn and internalrndiameters 6 & 12mn) with a 11/23 {ITound glass joint at a canron end andrnnarrower tips at other ends. The experimental conditions have beenrnestablished to determine 2.5xlU.- 5 -5x10- 2 M iron(I1I), as tetrachloroferrate(rnIII) and were found to be 4.0-5.5 M in total chloride andrn0.75-1.5 M in HCI with slope of 56.0 mV decade-1 and a detection limit ofrn7.9x1l'-6 M iron(III). Selectivity studies with 30 anions and cationsrnhave been made to screen the species which may interfere with ironrndetermination. The electro:e has been used reliably to measure iron inrnmineralized and vitaminized syrup, haematite, htUnan blood, and standardrnSarr[)les with direct standard addition, samDle addition and standardrnsubtraction notentiOOl0tric techniques. EDTA titrations have also shownrnthe feasibility of titration with the proposed electrode doyn torn1x10-4 M iron( III).

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