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Determination of submillimolar concentration of ferrate(VI) in alkaline solutions by amperometric titration

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Golovko D., Sharma V., Pavlova O., Belyanovskaya E., Golovko I., Suprunovich V., Zboril R.
Open Chemistry
|
2011
|
vol. 9
|
issue 5
808-812
EN
A new amperometric titration method was developed for quantitative determination of ferrate(VI) (FeVIO42−) in the 7.06×10−5−5.73×10−3 M concentration range. Chromium(III) hydroxide solution was used as the titrant. The diffusion current (Id) had a linear relationship with the concentration of ferrate(VI) and slopes were dependent on the concentration of NaOH. The amperometric titration could detect a lower concentration of ferrate(VI) than could potentiometric and colorimetric titrations. The method was applied successfully to determine concentrations of ferrate(VI), generated electrochemically, in strong alkaline solutions. [...]
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