ISO 2072-1981 主要用于铝生产的氧化铝 锌含量的测定 PAN光度法

标准号：ISO 2072-1981
中文标准名称：主要用于铝生产的氧化铝 锌含量的测定 PAN光度法
英文标准名称：Aluminium oxide primarily used for the production of aluminium; Determination of zinc content; PAN 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：71.100.10
适用范围：The 1-(2-pyridilazo)-2-naphthol method is applicable to products having zinc contents in the range between 0,002 % (m/m) and 0,12 % (m/m). Alkaline fusion of a test portion, and dissolution of the fused mass in nitric acid. Separation of the zinc in the form of its thiocyanate by extraction with 4-methylpentan-2-one. Re-extraction of the zinc with an aqueous hydrochloric acid solution. Formation of the PAN-zinc complex, at pH 7,5, in the presence of tartaric acid, sodium thiosulphate and 1-nitrose-2-naphthol-3,6-du