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Abstract
Abstract The direct determination of oxygen in organic compounds by reduction with carbon on a microscale by the Unterzaucher method is described, together with criteria of purity for the carbon and iodine pentoxide reagents employed. The method has been applied to rubbers and a relative precision of 2 per cent has been obtained i.e. : ±0.01 in the range 0 to 0.5% oxygen, ±0.02 in the range 0.5 to 1.0% oxygen, ±0.04 in the range 1.0 to 2.0% oxygen. For compounds containing larger percentages of oxygen, the method gives an absolute accuracy of ±0.2 or better. The method is speedier and yields more accurate results than when oxygen is determined by difference or by hydrogenation. A single determination requires but 30 minutes.
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