Dyeing and Chemical Technology of Textile Fibres - download pdf or read online

By E. R. Trotman

ISBN-10: 0852641656

ISBN-13: 9780852641651

Dyeing and Chemical expertise of cloth Fibres by way of E. R. Trotman

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Methylene blue can also be used as a reagent for quantitative estimation. 4 milliinole of well-purified methylene blue hydrochloride per litre. A measured volume of the solution is then withdrawn and the remaining methylene blue is determined either calorimetrically or by titration with Naphthol Yellow S. The latter method depends upon the fact that when a solution of Naphthol Yellow S is run into one containing methylene blue, a reddish-brown precipitate is formed, the blue colour of the solution becoming less intense and finally changing to yellow.

Methylene blue test Pure cellulose has no affinity for methylene blue, but the presence of carboxyl groups associated with acidic osycellulose or residual mineral acid associated with hydrocellulose formation do cause cellulosic fibres to absorb the dye. Both qualitative and quantitative tests are based on these facts. If cotton be immersed in a cold solution of methylene blue and then rinsed with boiling water, any significant degree of staining indicates degradation. Methylene blue can also be used as a reagent for quantitative estimation.

Hydrocellulose is usually accompanied by residual traces of acid. If there is a reduction in the methylene blue absorption brought about by boiling in dilute sodium hydroxide, it indicates the presence of acid, because this treatment has no effect upon the number of carbosyl groups. The latter will only be converted into sodium carbosylate which will revert to sodium chloride and carboxylic acid groups with the hydrogen chloride in the methylene blue hydrochloride. Silver nitrate test This is also referred to as Harrison’s test.

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Dyeing and Chemical Technology of Textile Fibres by E. R. Trotman

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