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Date of Issue : Aug 1999 1. IDENTIFICATION
General Product Name : SODIUM METABISULPHITE Other Names : SODIUM PYROSULPHITE ; SODIUM BISULPHITE ANHYDROUS SODIUM ACID SULPHITE UN No. : N/A Dangerous Goods Class : None Allocated Subsidiary Risk : None Allocated Hazchem Code : N/A Pack Group : 0 EPG : N/A Poisons Schedule : N/A Uses : In foods, as preservative, lab reagent.
1.1 Physical Description / Properties
Appearance : White crystalline solid with slight sulphur dioxide odour. Formula : Na2S2O5 Boiling Point : N/A deg C Melting Point : N/A deg C Vapour Pressure : N/A Specific Gravity : N/A (water = 1) Flash Point : N/A pH : 3.5 - 5.0 (5% solution) Solubility in water : 470 g/l (25 deg C) Flammability Limits (as percentage volume in air) Lower Explosion Limit : N/A Upper Explosion Limit : N/A 1.2 Other Properties
Decomposition starts at approx 150 deg C. Density in bulk: 1000 - 1200 g/dm3. Distribution coefficient n-octanol/water: -3.7. 1.3 Ingredients
2. HEALTH HAZARD INFORMATION
2.1 Health Effects - Acute Swallowed
Harmful if swallowed. Eye
Irritant - risk of serious damage to eyes. Skin
Irritant - sensitisation on persons allergic to the product. Inhaled
Irritating to respiratory system. 2.2 Health Effects - Chronic
No information available.
2.3 First Aid
Swallowed
Let ingest water - seek medical attention.
Eye
Immediately rinse with water for at least 15 minutes - seek medical advice.
Skin
Remove all contaminated garments. Thoroughly wash with water for at least 15 minutes.
Inhaled
Move to open air - supply pure oxygen or proceed to artificial respiration if breathing is diffulcult.
First Aid Facilities
Ensure an eye bath and safety shower are available and ready for use.
2.5 Advice to Doctor
Treat symptomatically based on individual reaction of patient and judgement of doctor.
2.6 Toxicity Data
Oral (rat) LD50: 1540 mg/kg.
3. PRECAUTIONS FOR USE
3.1 Exposure Standards
Worksafe recommends TWA = 5 mg/m3
3.2 Engineering Controls
Ensure adequate ventilation to maintain exposure levels below standards.
3.3 Personal Protection
Use antidust mask (filter P1), safety gloves, safety glasses with side guards - do not wear contact lenses.
3.4 Flammability
Material is non-flammable. SAFE HANDLING INFORMATION
4.1 Storage / Transport
Keep containers closed to avoid product oxidation - avoid powders forming. Store in a cool dry and well ventilated place - do not store near oxidants, acids or alkalis.
4.2 Packaging / Labelling UN No. N/A Class None Allocated Sub Risk None Allocated Hazchem Code N/A Pack Group 0 EPG No. N/A Shipping Name SODIUM METABISULPHITE Hazard HARMFUL
Risk Phrases R22 Harmful if swallowed. R31 Contact with acids liberates toxic gas. R36/37 Irritating to eyes and respiratory system.
Safety Phrases S8 Keep container dry. S26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
4.3 Spills and Disposal
Spills
Clean up personnel should wear suitable protection including breathing protection. Ensure area is suitably ventilated. Prevent product from entering sewers or watercourses. Do not allow to mix with oxidants, strong acids or alkalis.
For small quantites rinse with water and treat the contaminated water oxidising it with hydrogen peroxide and neutralising with soda or lime. For big quantities collect mechanically in suitable containers for disposal.
Disposal
Inorganic product not to be disposed of through biological treatment systems - Product resduals to be disposed of according to official current regulations and using authorised disposal pumps. Disposal of contaminated packages: empty the package, unfold it completely and dispose of it according to the packaging material.
4.4 FIRE AND EXPLOSION HAZARD Fire / Explosion
Non-flammable product. Material will decompose and generate sulphur dioxide gas.
Extinguishing Media
Firefighters should wear full protective clothing including self contained breathing apparatus. Use water as extinguishing media in case of nearby fire. The water used for extinguishing fire, contaminated by the product must be disposed of accrding to current local regulations. 5 OTHER INFORMATION
Other Information
If discharged into surface water, the product can casue considerable oxygen reduction, with negative consequences on living organisms. Fish toxicity (acute toxicity) - Salmo gairdneri LC50: 150 - 220 mg/l/96h. Toxicity to Daphnia (acute) - Daphnia magna EC50 (48h): 89 mg/l. Toxicity to Daphnia (chronic) - Daphnia magna NOEC (21d): 10 mg/l. Toxicity to seaweeds - Scenedesmus subspicatus EC50 (72h): 48 mg/l. Biotoxicity - Pseudomonas putida EC50 (17h): 56 mg/l. COD: 165 mg/g.
5.1 Contact Points
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The information above is believed to be accurate and represents the best information currently available to us. However, we make no warranty of merchantability or any other warranty, express or implied, with respect to such information, and we assume no liability resulting from its use.
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