利用声学法测量和表征粒子特性.第1部分:超声波衰减光谱图的概念和方法

[中文适用范围]： ISO 20998 的这一部分描述了用于确定分散在液体中的一种或多种材料相的尺寸分布的超声波方法。 胶体、分散体、浆液和乳液均在 ISO 20998 本部分的范围内。 此类分析的典型粒径范围为 10 nm 至 3 mm，但也已成功测量了超出此范围的颗粒。 测量的分散相浓度范围为 0.1%（体积）至 50%（体积）或更高，具体取决于连续相和分散相之间的密度对比。 这些方法可用于监测粒度分布的动态变化，包括浓缩系统中的附聚或絮凝。 [外文原描述]： ISO 20998-1:2006 describes ultrasonic methods for determining the size distributions of one or more material phases dispersed in a liquid. Colloids, dispersions, slurries and emulsions are within the scope of ISO 20998-1:2006. The typical particle size for such analysis ranges from 10 nm to 3 mm, although particles outside this range have also been successfully measured. Measurements can be made for concentrations of the dispersed phase ranging from 0,1 % by volume up to 50 % or more by volume, depending on the density contrast between the continuous and the dispersed phases. These methods can be used to monitor dynamic changes in the size distribution, including agglomeration or flocculation in concentrated systems.