Abstract
A quantitative colorimetric method has been developed for the determination of cotton (cellulose), viscose (regenerated cellulose), acetate (cellulose diacetate), and Arnel2 (cellulose triacetate) in binary textile fiber blends. The anthrone and the phenol—sulfuric acid colorimetric methods were found to be suitable for the determination of cellulose, regenerated cellulose, and certain cellulose esters after pretreatment with 70% sulfuric acid at room temperature. Standard curves for glucose prepared by each colorincetric method were the same as those obtained for cellulose and viscose when the difference in molecular weight between glucose (180) and a glucose residue (162) was taken into account. Both colorimetric methods can be used for the analysis of cellulose in standard binary blends containing no finishes or dyes. Commercially available cellulosic/non- cellulosic and cellulosic/cellulosic blends, some containing finishes and dyes, were also analyzed. The phenol—sulfuric acid method is preferred for textile analysis since better results were obtained with it. The accuracy of this colorimetric method was ±3.0% and, in many instances, blends were analyzed with an accuracy of ±1.0% or better.
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