ISO 2069-1976 主要用于铝生产的氧化铝 钙含量的测定 火焰原子吸收法

标准号：ISO 2069-1976
中文标准名称：主要用于铝生产的氧化铝 钙含量的测定 火焰原子吸收法
英文标准名称：Aluminium oxide primarily used for the production of aluminium; Determination of calcium content; Flame atomic absorption 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：This method is applicable to products having Ca contents greater than 0,003 % (m/m). The principle consists in dissolution of a test portion by the influence of hydrochloric acid under pressure. Addition of sodium ions to promote and to stabilize the emission of calcium, and of lanthanum ions or triethanolamine to increase the sensitivity. Aspiration of the solution into an acetylene-dinitrogen monoxide flame and photometric measurement of the absorption of the 422,7 nm line emitted by a hollow-cathode calcium lamp. For the determination of higher CaO contents (over about 0,03 % (m/m)) an acetylene-air flame can be used. Replaces ISO Recommendation R 2069-1971.