Colorimetric determination of iron(II) and iron(III) in glass

摘要: A simple method to determine relative amounts of FeII and FeIII was developed for the analysis glass containing nuclear waste. The pulverized sample dissolved in a sulfuric acid–hydrofluoric acid mixture with ammonium metavanadate added preserve content. VV–VIV couple, which is strongly acid-dependent, caused be oxidized highly acidic dissolution then regenerated when solution adjusted pH 5 formation magenta FeII–Ferrozine complex. Boric complex fluoride permit regeneration FeII, otherwise would stabilized as content determined from absorbance at 562 nm, total Fe same after ascorbic had been reduce FeII. standard deviation 5%, range 3–97% Fe. validated by analysing frit spiked iron(II) sulfate and/or iron(III) solutions. applicable glasses (or minerals) that contain more than about 5%