標準號：ISO 4280-1977
中文標準名稱：工業用天然及人造冰晶石和氟化鋁 硫酸鹽含量的測定 硫酸鋇重量法
英文標準名稱：Cryolite, natural and artificial, and aluminium fluoride for industrial use; Determination of sulphate content; Barium sulphate gravimetric method
標準類型：D59;G10
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：D59;G10
國際標準分類號：71.060.20;73.060.40
適用范圍：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.