アントロン-ナフタリンジオール法による洗剤中のセルロースグリコール酸ナトリウムの分析

抄録

Ordinarily, the household detergents contain about 1% of sodium carboxymethyl cellulose (CMC) to prevent redeposition of soil. For the determination of CMC itself, nitric acid-methanol method is usual. This method is not applicable for the determination of CMC in household detergents, as the components which are insoluble in 80% methanol solution are added to CMC.
Anthrone or naphthalenediol method is used for the determination of CMC in household detergents. In the both methods, however, intensity of color development is influenced by the degree of substitution of hydrogen of hydroxy radicals by carboxymethyl radicals. If the degree of substitution isunknown, the content of CMC can not be found unless the degree of substitution is assumed. Furthermore, intensity of color development is influenced by ingredients of detergent.
Authors noted that intensity of color development of these methods indicate reverse relationship with the degree of substitution, and found that combination of these two method is available to determine both the content and the degree of substitution. At the same time, the measuring conditions were investigated for. As a result, this method is useful for the determination of CMC in household detergents.