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