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Cryolite, natural and artificial -- Determination of sodium content -- Flame emission and atomic absorption spectrophotometric methods
The methods are applicable as alternatives to products for which the molar ratio NaF/AlF3 is equal to about 3.
The principle of the flame emission method consists in atomization of the test solution in a flame of oxygen/hydrogen and determination by measurement of the intensity of the radiation at 589 nm.
The principle of the flame atomic absorption method is based on atomization in an air/acetylene flame and measurement of the absorption of the 589 nm line emitted by a sodium hollow-cathode lamp.
The preparation of the test solution is carried out by dissolution of a test portion in hydrochloric acid and water after attack by concentrated sulphuric acid.
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