标准摘要
[中文适用范围]： 制备 0.5% (m/m) 肥皂水溶液，在测试温度下保持 24 小时后，取出该溶液的等分部分。 将该等分部分与分散剂（表面活性剂）的稀溶液混合，随后与指定体积的已知钙硬度的水混合。 将混合物在测试温度下保持1小时，然后在溴甲酚绿作为指示剂的存在下，用盐酸标准体积溶液滴定存在于下层的等分部分中的钙皂。 [外文原描述]： A 0,5 % (m/m) aqueous soap solution is prepared, and after maintaining this at testing temperature for 24 h, an aliquot portion of this solution is taken. This aliquot portion is mixed with a dilute solution of the dispersing agent (surface active agent) and subsequently with a specified volume of water of known calcium hardness. The mixture is maintained for 1 h at the testing temperature and then the calcium soap present in a aliquot portion of the lower layer is titrated with a standard volumetric solution of hydrochloric acid in the presence of bromcresol green as indicator.
英文名称Surface active agents — Determination of the power to disperse calcium soap — Acidimetric method (Modified Schoenfeldt method)