Ferrimetric determination of uraniumIV using rhodamine 6G as fluorescent indicator

Amperometric Titration of Uranium(IV) with Iron(III).

“…The drifting potentials encountered at room temperature have been attributed to a slow chemical reaction, slow electrode response, or both. Sagi and Rao (14) in a recent publication concluded that the uranium (IV)iron(III) reaction is "very slow at concentrations of uranium (IV) and iron (III) encountered near the equivalence point in a volumetric titration." Florence (6), however, in another recent paper states that in the potentiometric titration "high temperatures are necessary only for the rapid establishment of equilibrium potentials at the indicator electrode, since in dilute sulfuric acid at In the amperometric titration the rotating platinum electrode responds exclusively to iron(III) and the response time of the electrode is within the time required to mix the contents of titration vessel after the addition of an increment of titrant.…”

“…Sagi and Rao (14) used Rhodamine 6G as a fluorescent indicator. Florence (6) carried out the titration spectro- 1 Present address.…”

Kinetics of the Uranium (IV)-Iron (III) Reaction and Methods of End Point Detection.

“…has been the most popular method of detecting the end point of the U(IV)-Fe(III) reaction {6, 7). However spectrophotometry (4), amperometry (4,9), and visual indicators (5) have also been used with varying success.…”

“…They also discussed the catalytic effect of glass wool on thermal decomposition of alkaloids in the chromatograph. Parker, Fontan, and Kirk (5) presented retention data for 41 alkaloids chromatographed on an SE-30 column at five different temperatures, and reported the use of Carbowax 20M columns. Kazyak and Knoblock (8) compared the retention times of some alkaloids on SE-30 with those on QF-1 fluorinated silicone polymer.…”

Ruthenium 2,2´-Bipyridine Complexes as Fluorescent Oxidation-Reduction Indicators.

“…These indicators should be useful therefore in the potential range where diphenylamine-sulfonic acid functions in colorless solutions, but they do not have a transition potential high enough to be used in many reactions with strong oxidizing agents such as sulfatoand perchloratocerate. Rao and co-workers suggested Rhodamine 6G as a fluorescent indicator for ;he titration of uranium(IV) with iron(III) (6) and vanadium(IV) with sulfatocerate (7).…”