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Food additives data book - wordpres

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Preservatives 780<br />

NAME: Potassium metabisulphite<br />

CATEGORY: Antimicrobial preservative<br />

FOOD USE: <strong>Food</strong> preservative/ Antioxidant/ Steriliser/ Brewing, wine making. Not for use in meats, sources of<br />

vitamin B1, raw fruits and vegetables, or fresh potatoes<br />

SYNONYMS: CAS 16731-55-8/ EINECS 240-795-3/ E224/ Disulfurous acid dipotassium salt/ Potassium pyrosulfite/<br />

Potassium disulfite/ Dipotassium disulfite<br />

FORMULA: K2 S2 O5<br />

MOLECULAR MASS: 222.32<br />

ALTERNATIVE FORMS: Sodium sulphite, sodium bisulphite, sodium metabisulphite, sulphur dioxide, calcium sulphite, calcium<br />

bisulphite<br />

PROPERTIES AND APPEARANCE: White granules or powder, pungent sharp odour<br />

MELTING RANGE IN °C: >300, decomposes at 150–190<br />

DENSITY AT 20°C (AND OTHER 2.34<br />

TEMPERATURES) IN g/l:<br />

PURITY %: 57.6 as SO 2<br />

HEAVY METAL CONTENT MAXIMUM IN 10 (as Pb)<br />

ppm:<br />

ARSENIC CONTENT MAXIMUM IN ppm: 3<br />

SOLUBILITY % AT VARIOUS TEMPERATURE/pH COMBINATIONS:<br />

in water: @ 20°C 25 @ 50°C Slightly soluble @ 100°C Slightly soluble<br />

in ethanol solution: @ 5% Slightly soluble @ 20% Slightly soluble @ 95% Slightly soluble<br />

@ 100% Slightly soluble

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