标准摘要
[中文适用范围]： 将不同浓度的待测物质溶液与不同已知钙硬度的硬水溶液混合。 将溶液放置在特定条件下后，观察其外观，即澄清度、乳光、混浊或沉淀。 本方法适用于溶于20℃水的表面活性剂。 它可以扩展到那些在大约 50 时可溶的物质。 [外文原描述]： Solutions of the substance to be tested in differing concentrations are mixed with hard water solutions of differing known calcium hardness. After leaving the solutions to stand in specified conditions their appearance, i.e. clearness, opalescence, cloudiness or precipitation is observed. The method is applicable to surface active agents soluble in water at 20 °C. It can be extended to those which are soluble at approximately 50 °C.
英文名称Surface active agents — Determination of stability in hard water