The determination of iodide by its inhibitory effect on the reduction of phenosafranine by EDTA

Amperometric titrations

“…Micromolar concentrations of mercury®) have been titrated at a rotating gold electrode with EDTA and related compounds (288). The end point in the titration with EDTA has also been located by thionine photoredox indication (242). Although less selective than K3 Fe(CN)e, Hg(OAc)2 has been used to titrate Dpenicillamine hydrochloride (290) and in the titration of mercury®) at pH 1 with thiopiperidone (272).…”

“…This titration has also been run by short-circuit amperometry against a permanganate or vanadium reference system (256). Biamperometric indication was used in the K4Fe(CN)e titration of nanogram amounts of zinc (202), zinc in the presence of 1,2-diaminocyclohexanetetraacetic acid (DCTA), when the presence of ions such as Fe2+, Cd2+, and Cu2+ can be tolerated (241), and also of cadmium in fusible alloys, sifter removal of tin, antimony, and copper (218). In the attempted KsFelCNle titration of scandium and other rare earths in 60% ethanolic 1M KNO3, the RPE slowly became passivated (279).…”

“…Submicrogram quantities of zinc have been coulometrically titrated with EDTA to a biamperometric end point (128). The titration of zinc, calcium, or mercu-ry®) has been run with the aid of thionine as an amperometric photoreduction indicator (242), and the technique has been extended to the determination of anions such as HPO42-, SO42-, CrC>42-, and Fe(CN)e4_. A metal ion is added as precipitant, then the excess is back titrated with EDTA (245).…”

“…Biamperometric titration with NH4VO3 has been used to determine iron(II) in yttrium iron garnet (48). Vanadate (243), dichromate (244), and iodate (244) have been coulometrically titrated with iron(II) that is generated in the presence of EDTA. RPE titration with Mohr's salt has been used to determine vanadium and chromium in slags (291).…”

Kinetic determination of iodide in pharmaceutical and food samples

“…Most catalytic methods use the CetV-Asl'' reaction.614 Other reactions catalysed and inhibited by iodide have also been described. [15][16][17][18][19][20][21][22][23][24][25][26] In this paper a kinetic method for the determination of iodide based on its inhibitory effect on the H2P02--(Co1"-EDTA)-Pd" system is presented. The procedure has been successfully applied to the determination of iodide in pharmaceutical preparations, iodinated salts and milks.…”