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ISO 3360:1976

Phosphoric acid and sodium phosphates for industrial use (including foodstuffs) -- Determination of fluorine content -- Alizarin complexone and lanthanum nitrate photometric method
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ISO 3360:1976

Phosphoric acid and sodium phosphates for industrial use (including foodstuffs) -- Determination of fluorine content -- Alizarin complexone and lanthanum nitrate photometric method

PUBLISH DATE 1976
ISO 3360:1976

Applicable to products the F content of which is equal to or more than 0.5 mg/kg.

Specifies the separation of the element from a test portion by steam distillation in a phosphoric acid medium.

Formation of a blue-coloured complex with a combined reagent alizarin complexone/lanthanum nitrate in a buffered medium at the pH of 4.6.

Addition of acetone to increase the stability of the complex and the sensitivity.

Photometric measurement of the complex at a wavelength of about 600 nm.

SDO ISO: International Organization for Standardization
Document Number ISO 3360
Publication Date Aug. 15, 1976
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 47
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