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

Sulphuric acid and oleums for industrial use -- Determination of sulphur dioxide content -- Iodometric method

Sulphur for industrial use -- Determination of loss in mass at 80 degrees C

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

Sodium hydroxide for industrial use -- Determination of chloride content -- Mercurimetric 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

Sulphur for industrial use -- Determination of arsenic content -- Silver diethyldithiocarbamate photometric 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 hydroxide for industrial use -- Determination of mercury content -- Flameless atomic absorption spectrometric method

Hydrochloric acid for industrial use -- Determination of soluble sulphates -- Turbidimetric method

Phosphoric acid for industrial use (including foodstuffs) -- Determination of total phosphorus (V) oxide content -- Quinoline phosphomolybdate gravimetric method

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

Liquefied anhydrous ammonia for industrial use -- Determination of oil content -- Gravimetric and infra-red spectrometric methods

Sodium hydroxide for industrial use -- Method of assay

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

Liquid chlorine for industrial use -- Determination of water content -- Gravimetric method