By E. R. Trotman
Dyeing and Chemical expertise of cloth Fibres via E. R. Trotman
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Extra resources for Dyeing and Chemical Technology of Textile Fibres
1%~ cotton is tinally washed with 2s sulphuric acid, and the combined tiltratesarc titrated with standardized potassium permanganate. Fehling’s solution can also be used as a qualitative test for the presence of aldehyde groups due to either hydrocellulose or osycellulose formation. \Vhen cotton is boiled gently with the Fehling’s solution for about 10 minutes a red deposit of cuprous oxide can be observed either in local patches or as a uniform stain, according to the distribution of the degradation.
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.
Fehling’s solution can also be used as a qualitative test for the presence of aldehyde groups due to either hydrocellulose or osycellulose formation. \Vhen cotton is boiled gently with the Fehling’s solution for about 10 minutes a red deposit of cuprous oxide can be observed either in local patches or as a uniform stain, according to the distribution of the degradation. 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.