The ESR spectrometric titration of iron(II) in water with chromium(VI)

Iron(II) was determined with chromium(VI) by monitoring the formation of chromium(III) in a fixed magnetic field. The solutions were circulated through a flat ESR cell during titration by a peristaltic pump, allowing precise repositioning of the sample cell in the spectrometer cavity and maintenance...

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Bibliographic Details
Published inAnalytical proceedings Vol. 22; no. 12; pp. 379 - 380
Main Authors Thorburn Burns, D, Dalgarno, B G, Flockhart, B D
Format Journal Article
LanguageEnglish
Published 01.01.1985
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Summary:Iron(II) was determined with chromium(VI) by monitoring the formation of chromium(III) in a fixed magnetic field. The solutions were circulated through a flat ESR cell during titration by a peristaltic pump, allowing precise repositioning of the sample cell in the spectrometer cavity and maintenance of optimal conditions. Initially incremental additions of titrant were made, and a precision of 0.4 per cent based on 6 replicates obtained. Titrant was then continuously delivered with the volume of titrant proportional to time, and a precision of 0.7 per cent based on 7 replicates was obtained. This technique was suggested where visual indicators were impracticable and where redox reactions giving sufficiently intense ESR signals occurred.
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ISSN:0144-557X