Sulphur dioxide
Properties
of sulphur dioxide is described
below
PHYSICAL
STATE; APPEARANCE:
COLOURLESS GAS OR
COMPRESSED LIQUEFIED GAS , WITH PUNGENT ODOUR.
PHYSICAL DANGERS:
The gas is heavier than air.
CHEMICAL DANGERS:
The solution in water is a medium strong acid. Reacts violently with
ammonia, acrolein, acetylene, alkali metals, chlorine, ethylene oxide,
amines, butadiene. Reacts with water or steam causing corrosion hazard.
Attacks many metals including aluminium, iron, steel, brass, copper and
nickel in presence of water. Incompatible with halogens. Attacks
plastics, rubber and coatings in liquid form.
OCCUPATIONAL EXPOSURE LIMITS:
TLV: 2 ppm; 5.2 mg/m3 (as TWA); 5 ppm; 13 mg/m3
(STEL) (ACGIH 1992-1993).
MAC: 2 ppm; 5 mg/m3 (1993).
OSHA PEL: TWA 5 ppm (13 mg/m3)
NIOSH REL: TWA 2 ppm (5 mg/m3) ST 5 ppm (13 mg/m3)
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 irritates strongly the eyes and the respiratory tract.
Inhalation of the gas may cause lung oedema (see Notes). Rapid
evaporation of the liquid may cause frostbite. The substance may cause
effects on the respiratory tract , resulting in asthma-like reactions,
reflex spasm of the larynx and respiratory arrest. Exposure may result
in death. The effects may be delayed. Medical observation is indicated.
EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged inhalation exposure may cause asthma.
Click here for help with converting
units
For more information see website:
http://www.cdc.gov/niosh/ipcsneng/neng0074.html
|
