Photochemical reduction of phenosafranine by edta and its use in amperometric titrations

Amperometric, bipotentiometric, and coulometric titrations

“…The biamperometric titration of lead with EDTA has been reported (279). Photochemically-reduced toluidine blue (264), phenosafranine (257), and brilliant cresyl blue (258) have been used as amperometric indicators in the RPE titration of lead with DCTA (264) or EDTA (257,258). Lead in brass has been biamperometrically titrated with chloranilic acid (68).…”

“…With H202 as indicator, the biamperometric titration of copper, zinc, cadmium, or nickel can be carried out at 0.050 V (256). Under illumination, phenosafranine can act as an amperometric indicator in the RPE titration of copper, zinc, or lead with EDTA (257). Binary mixtures of copper with zinc, cadmium, lead, or cobalt have been titrated with transl,2-cyclohexane-Ar,Ar,jV',N'-tetraacetate in ethylenediaminemonoacetate medium (166).…”

Kinetic aspects of analytical chemistry

“…Ke et al (92) assayed iodine in serum, and Lauber (93) measured iodide in thyroid hormones both by using the same arsenic(III)-cerium(IV) reaction. A kinetic study of the photochemical reaction between phenosafraine (3,7-diamino-5phenylphenazinium chloride) and EDTA was described by Sierra and co-workers (94). These authors found that the reaction is strongly inhibited by iodide and subsequently developed a method for its determination (95).…”