THE DETERMINATION OF THE DEGREE OF SUBSTITUTION OF CARBOXYMETHYLCELLULOSE OVER THE ENTIRE SUBSTITUTION RANGE

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Abstract
The published methods for the determination of the degree of substitution of carboxymethylcellulose were found to be unsatisfactory for samples of high degree of substitution. Two methods were developed: one comprises the removal of the impurities from crude sodium carboxymethylcellulose by dialysis or washing with ethanol and determination of the sodium content; the other is based on the precipitation of cupric carboxymethylcellulose under controlled conditions, purification, and determination of the copper content.

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