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Date of Issue : Mar 2002 1. IDENTIFICATION
General Product Name : SODIUM HYDROSULPHIDE, > 25% WATER OF CRYSTALLIZATION Other Names : SODIUM HYDROSULPHIDE 70% SODIUM HYDROSULPHIDE, DIHYDRATE; SODIUM BISULPHIDE UN No. : 2949 Dangerous Goods Class : 8 Subsidiary Risk : None Allocated Hazchem Code : 2X Pack Group : II EPG : 23 Poisons Schedule : N/A Uses : Paper pulping, dyestuffs processing, rayon and cellophane desulfurising, unhairing hides, bleaching reagent.
1.1 Physical Description / Properties
Appearance : Yellow chips or flakes with a rotten egg-like odour. Formula : HNaS Boiling Point : >150 deg C Melting Point : 55 deg C Vapour Pressure : N/A Specific Gravity : 1.5 (water = 1) Flash Point : N/A pH : 11 (10 g/L water) Solubility in water : 620 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
Autoignition temperature = 120 deg C. Bulk density = approximately 750 kg/m3 Solublility in water = 62 g/100ml; soluble in ethanol, ether 1.3 Ingredients
2. HEALTH HAZARD INFORMATION
2.1 Health Effects - Acute Swallowed
Ingestion causes severe swelling, H2S formation in the stomach, severe damage to the delicate tissue and danger of perforation. Ingestion of larger amounts may cause defects to the central nervous system, dizziness, headache and unconsciousness. Eye
Causes corrosion of the eye tissue, permanent eye damage, lacrimation, redness of the eye tissue, visual disturbances. Skin
Causes severe irritation to the skin - corrosive. Inhaled
Dusts are highly corrosive and cause irritation to the respiratory tract. Hydrogen sulphide gas (H2S) is a strong irritant and may become overpowering. May cause irritation of the nasal mucous membranes, runny nose, headache, nausea, vomiting, dizziness, disturbances of consciousness and respiratory difficulties. 2.2 Health Effects - Chronic
May cause impaired memory, paralysis, impairment of the nervous system.
2.3 First Aid
Swallowed
Clean mouth with water and drink 1-3 glasses of water. Induce vomiting, but only if victim is fully conscious. Seek medical attention immediately.
Eye
Rinse eyes immediately with running water for at least 15 minutes, retracting eyelids often. Do not apply neutralising agents. Consult a doctor/medical service.
Skin
Take off contaminated clothing and shoes immediately. Wash off immediately with plenty of water. Cover wound with sterile dressing. Do not remove clothing if sticks to the skin. Consult a doctor/medical service.
Inhaled
Remove victim to fresh air - avoid becoming casualty. If NOT breathing apply artificial respiration. If breathing is difficult, experienced person may administer oxygen. Transport to a doctor or hospital immediately.
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 judgement of doctor and individual reactions of patient. Provide fresh air, rest and warmth.
2.6 Toxicity Data
Oral LD50 = 200 mg/kg (rat) Intraperitoneal LD50 = 14.6 mg/kg (rat) Intraperitoneal LD50 = 18 mg/kg (mouse) Carcinogenicity = not listed (IARC)
3. PRECAUTIONS FOR USE
3.1 Exposure Standards
No exposure limit has been established for this particular product, however, the decomposition product Hydrogen Sulphide has the following limits : Sodium sulphide : TWA 10 ppm (14 mg/m3) STEL 15 ppm (21 mg/m3)
3.2 Engineering Controls
Ensure adequate ventilation to maintain exposure below limits, especially in confined areas. Use adequate exhaust ventilation and dust collection.
3.3 Personal Protection
Eye protection - wear a face shield; in case of dust production wear protective goggles. Skin protection - wear gloves and protective clothing (material for protective clothing : rubber). In case of dust production wear head/neck protection. Respiratory protection - wear a gas mask with filter type B on heating. Wear a dust mask with filter type P3 if dust production occurs.
3.4 Flammability
Keep away from heat and ignition sources (NO SMOKING). SAFE HANDLING INFORMATION
4.1 Storage / Transport
Keep container tightly closed. Store in a dry, well ventilated area. Keep away from heat sources, ignition sources, combustible materials, oxidising agents and acids. Avoid raising dust. Do not discharge the waste into the drain. Remove contaminated clothing immediately. Clean contaminated clothing. Avoid contact with aluminium, copper and zinc. Product is hygroscopic.
4.2 Packaging / Labelling UN No. 2949 Class 8 Sub Risk None Allocated Hazchem Code 2X Pack Group II EPG No. 23 Shipping Name SODIUM HYDROSULPHIDE, > 25% WATER OF CRYSTALLIZATION Hazard CORROSIVE
Risk Phrases R31 Contact with acids liberates toxic gas. R34 Causes burns.
Safety Phrases S1/2 Keep locked up and out of the reach of children. 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 full protective clothing including self-contained breathing apparatus. Ensure adequate ventilation of the spill site. Avoid dust formation. Prevent soil and water pollution. Substance must not be discharged into the sewer. Knock down/dilute dust cloud with water spray. Plug the leak, cut off the supply. Dam up the solid spill.
Stop dust cloud by covering with sand/earth. Solid spill - neutralise with sodium bicarbonate. Scoop solid spill into closing containers. For powdered; do not use compressed air for pumping over spills. Carefully collect the spill or leftovers. Clean contaminated surface with an excess of water. Take collected spill to manufacturer/competent authority.
Disposal
Landfill or incinerate at an approved site in accordance with national and local regulations. Neutralise with 5% hydrogen peroxide. Remove to an authorised dump (Class I).
4.4 FIRE AND EXPLOSION HAZARD Fire / Explosion
Reacts slowly with water/(moist) air releasing toxic/combustible gases/vapours such as hydrogen sulphide and releasing corrosive products such as sodium hydroxide. On heating, product may emit toxic/combustible gases/vapours of hydrogen sulphide and sulphur oxides. On burning, product will release toxic and corrosive gases/vapours (sulphur oxides). Reacts with some acids releasing toxic/combustible gases/vapours of hydrogen sulphide. Reacts with strong oxidisers releasing toxic and corrosive gases/vapours of sulphur dioxide. Avoid heat sources, ignition sources, combustible materials, oxidising agents, acids , aluminium, copper and zinc.
Extinguishing Media
Fire-fighters should wear full protective clothing including self-contained breathing apparatus. Use water spray, polyvalent foam, ABC powder or carbon dioxide to extinguish. Cool tanks/drums with water spray or remove them into safety. Dilute toxic gases with water spray. Take account of toxic fire fighting water. 5 OTHER INFORMATION
Other Information
Mobility - exothermically soluble in water. Bioaccumulation - low POW = -3.5 - BCF = Not detected. Aquatic toxicity - LC50 = > 0.0243 mg/l (Pimephales promelas, 96hr) WGK : 2 Effect on the ozone layer = Not detected Waste water purification = Not detected
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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