Hydrogen sulfide
Properties
of hydrogen sulfide is described
below
PHYSICAL
STATE; APPEARANCE:
COLOURLESS COMPRESSED
LIQUEFIED GAS , WITH CHARACTERISTIC ODOUR OF ROTTEN EGGS.
PHYSICAL DANGERS:
The gas is heavier than air and may travel along the ground; distant
ignition possible. As a result of flow, agitation, etc., electrostatic
charges can be generated.
CHEMICAL DANGERS:
Heating may cause violent combustion or explosion. The substance
decomposes on burning producing toxic gases (sulfur oxides). Reacts
violently with strong oxidants, causing fire and explosion hazard.
Attacks many metals and some plastics.
OCCUPATIONAL EXPOSURE LIMITS:
TLV: 10 ppm as TWA;
15 ppm as STEL; (ACGIH 2004).
MAC: 10 ppm, 14 mg/m³;
Peak limitation category: II(2); Pregnancy risk group: IIc;
(DFG 2004).
OSHA PEL: C 20 ppm 50 ppm 10-minute maximum peak
NIOSH REL: C 10 ppm (15 mg/m3) 10-minute
NIOSH IDLH: 100 ppm
ROUTES
OF EXPOSURE:
The substance can be
absorbed into the body by inhalation.
INHALATION RISK:
A harmful concentration of this gas in the air will be reached very
quickly on loss of containment.
EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes and the respiratory tract .
The substance may cause effects on the central nervous system . Exposure
may result in unconsciousness. Exposure may result in death. Inhalation
of gas may cause lung oedema (see Notes). The effects may be delayed.
Medical observation is indicated. Rapid evaporation of the liquid may
cause frostbite.
EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
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For more information see website:
http://www.cdc.gov/niosh/ipcsneng/neng0165.html
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