ISO 5930-1979 工业用天然及人造冰晶石和氟化铝 磷含量的测定 还原磷钼酸盐光度法

标准号：ISO 5930-1979
中文标准名称：工业用天然及人造冰晶石和氟化铝 磷含量的测定 还原磷钼酸盐光度法
英文标准名称：Cryolite, natural and artificial, and aluminium fluoride for industrial use; Determination of phosphorus content; Reduced molybdophosphate photometric method
标准类型：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：G10
国际标准分类号：71.060.20;73.060.40
适用范围：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.