肥皂 乙醇不溶物含量的测定

[中文适用范围]： 将肥皂溶解在乙醇中，过滤并称重未溶解的残留物。 不溶解的成分对应于在 95% (V/V) 乙醇中溶解度低或不溶的添加剂和异物，添加到肥皂中以及所有肥皂配方中的物质，例如碱金属碳酸盐和氯化物、硼酸盐、过硼酸盐、硫酸盐、硅酸盐、磷酸盐等。 它还可能由有机物质组成，如淀粉、糊精、酪蛋白、糖、纤维素衍生物、藻酸盐等。 [外文原描述]： The soap is dissolved in ethanol, filtrated and the undissolved residue is weighed. The constituents not dissolved correspond to the additives and foreign matter, of low solubility or insolubility in 95 % (V/V) ethanol, added to soaps and also to substances in all soap formulations, such as alkali carbonates and chlorides, borates, perborates, suphates, silicates, phosphates etc. It also may consist of organic substances like starches, dextrins, caseins, sugars, cellulose derivatives, alginates, etc.