標準號：ISO 5930-1979
中文標準名稱：工業用天然及人造冰晶石和氟化鋁 磷含量的測定 還原磷鉬酸鹽光度法
英文標準名稱：Cryolite, natural and artificial, and aluminium fluoride for industrial use; Determination of phosphorus content; Reduced molybdophosphate photometric method
標準類型：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：G10
國際標準分類號：71.060.20;73.060.40
適用范圍：Specifies a method applicable to products having phosphorus contents equal to or greater than 0,002 % (m/m). The principle is based on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid, dissolution of the fused mass in nitric acid, neutralization of suitable aliquot portion with sodium hydroxide solution, reaction with acid ammonium molybdate solution to form a molybdophosphate complex, reduction by a mixture of sodium disulphite and 4-amino-3-hydroxynaphtalene-1-sulphonic acid, and photometric measurement of the reduced complex.