ISO-3707 › Phosphoric acid for industrial use (including foodstuffs) -- Determination of calcium content -- Flame atomic absorption method

ISO-3707 - 1ST EDITION - CURRENT


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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.

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Document Number

ISO 3707:1976

Revision Level

1ST EDITION

Status

Current

Publication Date

Dec. 15, 1976

Committee Number

ISO TC 47