An electrometric indicator to replace starch in iodine titrations of sulphurous acid in fruit juices
✍ Scribed by Ingram, M.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1947
- Weight
- 493 KB
- Volume
- 66
- Category
- Article
- ISSN
- 0368-4075
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✦ Synopsis
Abstract
It has been shown that a bright platinum electrode, used in conjunction with a very simple reference electrode and electrometer, is .an effective substitute for starch in iodometric titrations of fruit juices. The error in the determination of the end‐point by this means is some five times smaller than with starch, and end‐points un be observed equally well in highly coloured juices such as blackcurrant where starch cannot be used at all. The improvement in accuracy results partly from the greater sensitivity of the electrometric indicator, and partly because it gives a continuous indication of the approach of the end‐point so that delay in approaching the end‐point can be reduced to a minimum. In addition, factors of personal judgement are eliminated, and the determinations do not depend on the prevailing conditions of lighting.