Cryolite, natural and artificial -- Determination of silica content -- Reduced molybdosilicate spectrophotometric method

Sodium carbonate for industrial use -- Determination of total soluble alkalinity -- Titrimetric method

Ammonium sulphate for industrial use -- Determination of ammoniacal nitrogen content -- Titrimetric method after distillation

Cryolite, natural and artificial -- Determination of fluorine content -- Modified Willard-Winter method

Sodium hydrogen carbonate for industrial use -- Determination of iron content -- 1,10- Phenanthroline photometric method

Sodium chloride for industrial use -- Determination of calcium and magnesium contents -- EDTA complexometric methods

Sodium and potassium silicates for industrial use -- Preparation of solution of products not easily soluble in boiling water and determination of matter insoluble in water

Ammonium sulphate for industrial use -- Determination of free acidity -- Titrimetric method

Sodium and potassium silicates for industrial use -- Determination of silica content -- Gravimetric method by insolubilization

Sodium carbonate for industrial use -- Preparation and storage of test samples

Sodium chlorate for industrial use -- Determination of chloride content -- Mercurimetric method

Cryolite, natural and artificial, and aluminium fluoride for industrial use -- Determination of sulphur content -- X-ray fluorescence spectrometric method

Cryolite, natural and artificial -- Determination of iron content -- 1,10- Phenanthroline photometric method

Sodium carbonate for industrial use -- Determination of matter insoluble in water at 50 degrees C

Sodium chloride for industrial use -- Determination of halogens, expressed as chlorine -- Mercurimetric method

Sodium hydrogen carbonate for industrial use -- List of methods of test and preparation of the test sample

Cryolite, natural and artificial -- Determination of calcium content -- Flame atomic absorption method

Sodium and potassium silicates for industrial use -- Determination of total alkalinity -- Titrimetric method

Sodium fluoride for industrial use -- Determination of fluorine content -- Modified Willard-Winter method

Cryolite, natural and artificial -- Conventional test for evaluation of free fluorides content