Air pollution

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.

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For more information see website:
http://www.cdc.gov/niosh/ipcsneng/neng0074.html






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