羧甲基纤维素钠取代度测定的新方法

Novel method on the determination of DS of CMC

对测定羧甲基纤维素（CMC）的取代度（DS）方法进行了探讨，发现虽然电导滴定法可较快地和较准确地测定DS，但是易受反应副产物的影响。采用红外光谱法可达到快速测定DS，并且可直观地大致判断出样品的纯度，以决定是否需要对样品进行提纯精制。

Degree of substitution of carboxpoethyl groups (DS) in carboxymethyl cellulose (CMC) had been discussed. It was found that the conductometric titration method was affected markedly by the by-products,although this method was a convenient one.The DS could be determined by using infrared spetrum more easily and rapidly, and at the same time the purity of CMC sample might be estimated, too.