ISO-5373 › Condensed phosphates for industrial use (including foodstuffs) -- Determination of calcium content -- Flame atomic absorption spectrometric method
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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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67.220.20 (Food additives Including salt, vinegar, food preservation additives, etc.)
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Document Number
ISO 5373:1981
Revision Level
1ST EDITION
Status
Current
Publication Date
Nov. 15, 1981
Committee Number
ISO TC 47