ISO 3698:1976
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Potassium hydroxide for industrial use — Determination of calcium and magnesium contents — Flame atomic absorption method
Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users
05-04-2019
English, French
01-12-1976
Applicable to products having contents of more than 2.5 mg Ca/kg and 0.5 mg Mg/kg if an acetylene-air flame is used or 0.6 mg Ca/kg and 1.0 mg Mg/kg if an acetylen-dinitrogen monoxide flame is used. The principle consists in the acidification of a test portion with hydrochloric acid, aspiration of the solution into an acetylene-dinitrogen monoxide flame or acetylene-air flame. In the latter case, addition of lanthanum ions in order to suppress certain interferences. Measurement of the absorption of the 422.7-nm and 285.2-nm lines emitted by calcium and magnesium hollow-cathode lamps.
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