适用于酸度（以H2 SO4表示）等于或大于0.01%（m/m）的产品。描述了用水和异丙醇（异丙醇）的混合物萃取酸性物质。以酚酞为指示剂，用标准体积氢氧化钠溶液滴定提取物。从实验室样品中制备样品的方法是研磨足量的未干燥材料，直到其通过250 m标称筛孔的筛子。

Applicable to products having acidities, expressed as H2 SO4, equal to or more than 0.01 % (m/m). Describes the extraction of acidic substances with a mixture of water and propan-2-ol (isopropyl alcohol). Titration of the extract with standard volumetric sodium hydroxide solution in the presence of phenolphthalein as indicator. The preparation of the sample from the laboratory sample is carried out by grinding a sufficient quantity of the undried material until it passes through a sieve of nominal mesh of 250 m.