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

标准编号：ISO 5930:1979

中文名称：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

英文名称：Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of phosphorus content — Reduced molybdophosphate photometric method

发布日期：1979-07

标准范围

规定了适用于磷含量等于或大于0002%（m/m）的产品的方法。该原理基于测试部分与碳酸钠和硼酸混合物的碱性熔融、熔融物在硝酸中的溶解、适当等分部分与氢氧化钠溶液中和、与酸性钼酸铵溶液反应形成磷钼酸盐络合物，通过二硫化钠和4-氨基-3-羟基萘-1-磺酸的混合物进行还原，并对还原的络合物进行光度测量。

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.

标准预览图