ANNEX I

E 514(i) SODIUM SULPHATE

Definition

Chemical name

Sodium sulphate

Chemical formula

Na2SO4 · nH2O (n = 0 or 10)

Molecular weight

142,04 (anhydrous)

322,04 (decahydrate)

Assay

Content not less than 99,0 % on the anhydrous basis

Description

Colourless crystals or a fine, white, crystalline powder

The decahydrate is efflorescent

Identification

A.

Positive tests for sodium and for sulphate

B.

Acidity of a 5 % solution: neutral or slightly alkaline to litmus paper

Purity

Loss on drying

Not more than 1,0 % (anhydrous) or not more than 57 % (decahydrate) at 130 °C

Selenium

Not more than 30 mg/kg

Arsenic

Not more than 3 mg/kg

Lead

Not more than 5 mg/kg

Mercury

Not more than 1 mg/kg