标准摘要
[中文适用范围]： 适用于三氧化硫含量等于或大于0.1%（m/m）的产品。 基于测试部分与碳酸钠和硼酸的混合物的碱熔融。 用高氯酸溶液萃取熔融物，并在酸化介质中用氯化钡沉淀硫酸根离子。 用细质无灰滤纸（孔径约0.4～1.0m）过滤。 干燥后在电烘箱中于(850±20)℃下煅烧。 称量残留物。 [外文原描述]： Applicable to products having a content, expressed as sulphur trioxide, equal to or more than 0.1 % (m/m). Bases on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid. Extraction of the fused mass with perchloric acid solution and precipitation of the sulphate ions with barium chloride in an acidified medium. Filtration on a fine-texture, ashless filter paper (pore diameter approximately 0.4 to 1.0 m). Calcination after drying in an electric oven at (850 20) °C. Weighing of the residue.
英文名称Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method