SCHEDULED MAINTENANCE
An improved oxalate method for the determination of active oxygen in manganese dioxide
Abstract
Of the various methods available for the determination of active oxygen in managanese dioxide, the oxalate method is preferred because of its simplicity and reproducibility. However, it tends to give higher results than the iron(II) and Bunsen methods, the discrepancies being greater with synthetic materials than with ores. In confirmation of the work of other authors it has been shown that there is a Mn2+ catalysed loss of oxalate that causes the high results. It is concluded that the loss is caused by oxidation by oxygen dissolved in the reagent solutions. With the addition of Cu2+ or Fe3+, the oxalate method gives results that are comparable with those of the iron(II) method. The stabilisation of oxalate with Fe3+ has been used to speed up the time taken to dissolve samples by boiling them under reflux.
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