International Chemical Safety Cards AMMONIUM BISULFIDE ICSC: 1035 Ammonium hydrogen sulfide Ammonium hydrosulfide Ammonium sulfhydrate Ammonium mercaptan H5NS / (NH4)HS Molecular mass: 51.1 ICSC #    1035 CAS #     12124-99-1 RTECS # BS4900000 October 09, 2002 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible. Many reactions may cause fire or explosion. Gives off irritating or toxic fumes (or gases) in a fire. NO open flames. Foam, powder or carbon dioxide. EXPLOSION In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR!  •INHALATION Cough. Laboured breathing. Shortness of breath. Sore throat. Local exhaust or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN Redness. Pain. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.  •EYES Redness. Pain. Face shield, or eye protection in combination with breathing protection. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.  •INGESTION Abdominal cramps. Abdominal pain. Burning sensation in the mouth. Diarrhoea. Nausea. Vomiting. Do not eat, drink, or smoke during work. Rinse mouth. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Ventilation. Remove all ignition sources. Sweep spilled substance into air tight containers. Chemical protection suit including self-contained breathing apparatus. Separated from acids, oxidants , food and feedstuffs . Cool. Dry. Well closed. Keep in a well-ventilated room. Airtight. Do not transport with food and feedstuffs. R: S: SEE IMPORTANT INFORMATION ON BACK ICSC: 1035 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards AMMONIUM BISULFIDE ICSC: 1035 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: HYGROSCOPIC , WHITE TO YELLOW CRYSTALS , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: On combustion, forms ammonia fumes, nitrogen oxides and sulfur oxides. The substance decomposes at room temperature producing toxic and corrosive gases including ammonia and hydrogen sulfide . Reacts with acids producing hydrogen sulfide and sulfur oxides . Reacts violently with oxidants causing fire and explosion hazard. OCCUPATIONAL EXPOSURE LIMITS: TLV not established. ROUTES OF EXPOSURE: The substance can be absorbed into the body through the skin, by inhalation and by ingestion. INHALATION RISK: A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C. EFFECTS OF SHORT-TERM EXPOSURE: The substance is severely irritating to the eyes , the skin and the respiratory tract . EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Solubility in water, g/100 ml: 128.1 Vapour pressure, kPa at 22°C: 52 Flash point: See Notes ENVIRONMENTAL DATA This substance may be hazardous in the environment; special attention should be given to aquatic organisms. N O T E S The commercial product is available as a 40% solution that is more stable than the dry product. UN number for the solution is 2683. The substance is combustible but no flash point is available in literature. Insufficient data are available on the effect of this substance on human health, therefore utmost care must be taken. ADDITIONAL INFORMATION ICSC: 1035 AMMONIUM BISULFIDE (C) IPCS, CEC, 1994

IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.