ISO 5373-1981 工业(包括食品)用缩合磷酸盐 钙含量的测定 火焰原子吸收光谱法

标准号：ISO 5373-1981
中文标准名称：工业(包括食品)用缩合磷酸盐 钙含量的测定 火焰原子吸收光谱法
英文标准名称：Condensed phosphates for industrial use (including foodstuffs); Determination of calcium content; Flame atomic absorption spectrometric 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：71.060.50
适用范围：Applicable to products having Ca contents equal to or more than 50 mg/kg. The presence of soluble SiO2 up to 5 g/ml in the test solution does not interfere. Hydrolysis by boiling a test portion in hydrochloric acid medium. Addition of sodium ions, until a constant concentration is obtained, to stabilize the promotion and emission of Ca; addition of lanthanum chloride to increase the sensitivity of the method. Aspiration of the solution into a dinitrogen monoxide-acetylene flame. Spectrometric measurement of the absorption of the 422.7-nm line emitted by a hollow-cathode calcium lamp. Has also been approved by the IUPAC.