工业用硫磺 酸度的测定 滴定法

[中文适用范围]： 适用于酸度（以H2SO4表示）等于或大于0.01%（m/m）的产品。 描述了用水和 2-丙醇（异丙醇）的混合物萃取酸性物质。 在酚酞作为指示剂存在下，用标准容量的氢氧化钠溶液滴定提取物。 实验室样品的样品制备是通过研磨足够量的未干燥材料直至其通过标称目数为250 m的筛子来进行的。 [外文原描述]： 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.