Safety data sheet According to EC Directive 91/155/EEC

1. Identification of the substance/preparation and of the company/undertaking

Identification of the product
Catalogue No.:	823310
Product name:	Hydrogen sulfide for synthesis

Manufacturer/supplier identification
Company:	Merck Ltd. 9th Floor, Monterey Tower, 2170 New Petchburi Road, Bangkapi, Huaykwang, Bangkok 10320 Tel: (662) 308 - 0218

2. Composition/information on ingredients

CAS-No.:	7783-06-4		EC-Index-No.:	016-001-00-4
Molar mass:	34.08		EINECS-No.:	231-977-3
Molecular formula:	H2S

3. Hazards identification

Extremely flammable. Very toxic by inhalation. Very toxic to aquatic organisms.

4. First aid measures

First-aid personnel: ensure self-protection! After inhalation: fresh air. Immediately apply mechanical ventilation. If necessary oxygen mask. Immediately summon doctor. After skin contact: wash off with plenty of water. Immediately remove contaminated clothing. After eye contact: rinse out with plenty of water with the eyelid held wide open. Summon eye specialist. After swallowing: make victim drink plenty of water, induce vomiting. Immediately summon doctor.

5. Fire-fighting measures

Suitable extinguishing media:

CO2, powder.

Special risks:

Combustible. Formation of hazardous combustion gases or vapours possible in event of fire. Formation of explosive mixtures possible with air. Take measures to prevent electrostatic charging. The following may develop in event of fire: sulfur dioxide

Special protective equipment for fire fighting:

Do not stay in dangerous zone without suitable chemical protection clothing and self-contained breathing apparatus.

Other information:

Cool container with spray water from a save distance. Prevent fire-fighting water from entering surface water or groundwater.

6. Accidental release measures

Person-related precautionary measures: Immediately put on respirator. Avoid substance contact. Ensure supply of fresh air in enclosed rooms. Environmental-protection measures: Do not allow to enter sewerage system. Procedures for cleaning / absorption: Stop flow of gas, move leaking cylinder to open air if without risk.

7. Handling and storage

Handling:

Take measures to prevent electrostatic charging.

Storage:

Tightly closed. Dry. Cool. Keep away from combustible materials and sources of ignition. At +15°C to +25°C. Accessible only for authorized persons.

8. Exposure controls/personal protection

Specific control parameter
MAK Germany (max. workplace conc.)
Hydrogen sulfide	10 ml/m3 or 15 mg/m3

Personal protective equipment:
Respiratory protection:	required
Eye protection:	required
Hand protection:	required Protective clothing should be selected specifically for the working place, depending on concentration and quantity of the hazardous substances handled. The resistance of the protective clothing to chemicals should be ascertained with the respective supplier.
Industrial hygiene:	Immediately change contaminated clothing. Apply skin- protective barrier cream. Wash hands and face after working with substance. Under no circumstances eat or drink at workplace. Work under hood . Do not inhale substance.

9. Physical and chemical properties

Form:		gas
Colour:		colourless
Odour:		unpleasant
pH value
at 4 g/l water		(20 °C)	4.5
Melting temperature			-86 °C
Boiling temperature			-60 °C
Ignition temperature			270 °C
Flash point			not available
Explosion limits	lower		4.3 Vol%
	upper		45.5 Vol%
Vapour pressure		(20 °C)	~ 18000 hPa
Solubility in	water	(20 °C)	4 g/l

10. Stability and reactivity

Conditions to be avoided

Heating.

Substances to be avoided

ammonia , alkali metals , alkali hydroxides , alkaline earth hydroxides , oxygen , oxidizing agent , semimetallic oxides , metallic oxides , alkali oxides ( e.g. peroxi compounds ) , nitrogen oxides , K2Cr2O7 , halogen oxides , nitric acid , halogens , halogen-halogen compounds , amines

Hazardous decomposition products

sulfur dioxide

Further information

Formation of explosive mixtures possible with air.

11. Toxicological information

Acute toxicity

Quantitative data on the toxicity of this product are not available.

Subacute to chronic toxicity

Checks into the substance have so far not disclosed any investigations concerning possible teratogenic effects.

Further toxicological information

The following applies to hydrogen sulfide: odour perception limit 0.025 - 8 ppm. After inhalation: < 100 ppm: rhinitis, photophobia, mucosal irritations, coughing, irritations after contact with the eyes. > 500 ppm: headache, dizziness, ataxia (impaired locomotor coordination), cardiovascular disorders, agitation, spasms. Inhalation may lead to the formation of oedemas in the respiratory tract. > 1000 ppm: respiratory arrest within seconds to minutes. Late sequelae: the following organs may be damaged after uptake: lungs, heart, eyes.

12. Ecological information

Behavior in environmental compartments: Evaluation number (FRG) (bacteria): 5.8 Evaluation number (FRG) (fish): 6.3 Evaluation number (FRG) (mammal): 7 Ecotoxic effects: Toxic for aquatic organisms Fish toxicity: fish EC0: < 0.86 mg/l Daphnia toxicity: Daphnia magna EC50: < 1 mg/l The following applies to H2S: biological effects: fish: toxic as from 0.5 mg/l ; sulfide has a harmful effect on plankton and fish; hazard for drinking water! Further ecologic data: Risk of formation of explosive vapours above water surface. Do not allow to enter waters, waste water, or soil!

13. Disposal considerations

Product:

There are no uniform EC Regulations for the disposal of chemicals or residues. Chemical residues generally count as special waste. The disposal of the latter is regulated in the EC member countries through corresponding laws and regulations. We recommend that you contact either the authorities in charge or approved waste disposal companies which will advise you on how to dispose of special waste.

Packaging:

Disposal in compliance with official regulations. Handle contaminated packaging in the same way as the substance itself. If not officially specified differently, non-contaminated packaging may be treated like household waste or recycled.

14. Transport information

Transport over land ADR/RID and GGVS/GGVE (Germany)
GGVS/GGVE class:	2	Number and letter:
ADR/RID class:	2	Number and letter:
Name of material:	1053 SCHWEFELWASSERSTOFF

River transport ADN/ADNR

not examined

Sea transport IMDG
IMDG class:	2.3	UN-No.:	1053	Packaging group:
Ems:	2-05	MFAG:	640
Correct technical name:	HYDROGEN SULPHIDE

Air transport ICAO-TI and IATA-DGR
ICAO/IATA class:	2.3/2.1	UN/ID-No.:	1053	Packaging group:
Correct technical name:	HYDROGEN SULPHIDE - VERBOTEN

The transport regulations are cited according to international regulations and in the form applicable in Germany (GGVS/GGVE). Possible national deviations in other countries are not considered.

15. Regulatory information

Labelling according to EC Directives
Symbol:	F+	Extremely flammable immediately and show this container or label.
	T+	Very toxic immediately and show this container or label.
	N	Dangerous for the environment immediately and show this container or label.
R-phrases:	R 12-26-50	Extremely flammable. Very toxic by inhalation. Very toxic to aquatic organisms.
S-phrases:	S 9-16-28.1-36/37-45-61	Keep container in a well-ventilated place. Keep away from sources of ignition - No smoking. After contact with skin, wash immediately with plenty of water. Wear suitable protective clothing and gloves. In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible). Avoid release to the environment. Refer to special instructions/Safety data sheets.
EC-No.:	231-977-3	EC label

German regulations
Water pollution class	2	(polluting substance)

16. Other information

Reason for alteration

Change in labelling.