ISO 3707:1976
Phosphoric acid for industrial use (including foodstuffs); Determination of calcium content; Flame atomic absorption method
- Standard No.
- ISO 3707:1976
- Release Date
- 1976
- Published By
- International Organization for Standardization (ISO)
- Latest
- ISO 3707:1976
- Scope
- 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.
ISO 3707:1976 history
- 1976 ISO 3707:1976 Phosphoric acid for industrial use (including foodstuffs); Determination of calcium content; Flame atomic absorption method
