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

标准编号：ISO 3707:1976

中文名称：工业用（包括食品工业）用磷酸.钙含量的测定.火焰原子吸收法

英文名称：Phosphoric acid for industrial use (including foodstuffs) — Determination of calcium content — Flame atomic absorption method

发布日期：1976-12

标准范围

适用于钙含量超过50 mg/kg的产品。溶液中的可溶性SiO2含量低于5 g/ml时不会产生干扰。除试验部分的盐酸溶液外，该原理还包括钠离子，以促进和稳定钙和镧离子的排放，以抑制铝的干扰。指定将溶液吸入乙炔-一氧化二氮火焰。空心阴极发射的422.7-nm吸收线的光度测量-阴极钙灯。也得到了IUPAC的批准。

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.

标准预览图