ISO 5142:1977
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Sodium sulphate for industrial use — Determination of sodium sulphate content — Gravimetric method
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27-02-2019
English, French
01-12-1977
Applicable to products in which not all impurities are known or determined. The methods specified in ISO 3237 cannot be applied. The principle consists in dissolution of a test portion, removal of insoluble matter, iron, aluminium and calcium from the solution and evaporation to dryness in the presence of sulphuric acid. Heating and weighing of the total amount. Calculation of the sodium sulphate content by subtraction of the amount arising from any sodium chloride and sodium carbonate. Has also been approved by the IUPAC.
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