ISO 4280-1977 工业用天然及人造冰晶石和氟化铝 硫酸盐含量的测定 硫酸钡重量法

标准号：ISO 4280-1977
中文标准名称：工业用天然及人造冰晶石和氟化铝 硫酸盐含量的测定 硫酸钡重量法
英文标准名称：Cryolite, natural and artificial, and aluminium fluoride for industrial use; Determination of sulphate content; Barium sulphate gravimetric method
标准类型：D59;G10
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：D59;G10
国际标准分类号：71.060.20;73.060.40
适用范围：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) 鳦. Weighing of the residue.