ISO 5373:1981 工业（包括食品工业）用浓缩磷酸盐.钙含量的测定.火焰原子吸收光谱测定法

标准编号：ISO 5373:1981

中文名称：工业（包括食品工业）用浓缩磷酸盐.钙含量的测定.火焰原子吸收光谱测定法

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

发布日期：1981-11

标准范围

适用于钙含量等于或大于50 mg/kg的产品。试验溶液中的可溶性SiO2含量高达5 g/ml不会产生干扰。通过在盐酸介质中煮沸试验部分进行水解。添加钠离子，直到获得恒定浓度，以稳定钙的促进和排放；添加氯化镧以提高方法的灵敏度。将溶液吸入一氧化二氮乙炔火焰中。空心阴极钙灯发射的422.7-nm吸收线的光谱测量。也得到了IUPAC的批准。

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.

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