ISO 3707-1976 工业(包括食品)用磷酸 钙含量的测定 火焰原子吸收法

标准号：ISO 3707-1976
中文标准名称：工业(包括食品)用磷酸 钙含量的测定 火焰原子吸收法
英文标准名称：Phosphoric acid for industrial use (including foodstuffs); 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：71.060.30
适用范围：Applicable to products having a Ca content of more than 50 mg/kg. Soluble SiO2 present in the solution at levels lower than 5 g/ml does not interfere. The principle consists in addition, to a hydrochloric acid solution of the test portion, of sodium ions to promote and stabilize the emission of calcium and of lanthanum ions to suppress the interference of aluminium. Specifies the aspiration of the solution into an acetylene-dinitrogen monoxide flame. Photometric measurement of the absorption of the 422.7-nm line emitted by a hollow- cathode calcium lamp. Has also been approved by the IUPAC.