Disodium disulfite
Disodium pyrosulfite
Sodium metabisulfite
Na2O5S2
Molecular mass: 190.1
ICSC # 1461
CAS # 7681-57-4
RTECS # UX8225000
EC # 016-063-00-2
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Not combustible.
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In case of fire in the surroundings: use appropriate extinguishing media.
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Explosion
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Exposure
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PREVENT DISPERSION OF DUST!
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•Inhalation
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Cough.
Wheezing.
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Local exhaust or breathing protection.
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Fresh air, rest.
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•Skin
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Protective gloves.
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First rinse with plenty of water, then remove contaminated clothes and rinse again.
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•Eyes
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Redness.
Pain.
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Safety goggles.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Abdominal pain.
Diarrhoea.
Nausea.
Vomiting.
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Do not eat, drink, or smoke during work.
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Rinse mouth.
Give plenty of water to drink.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Do NOT absorb in saw-dust or other combustible absorbents.
Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting.
(Extra personal protection: P2 filter respirator for harmful particles.)
Do NOT let this chemical enter the environment.
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Separated from
acids,
and
strong oxidants.
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Xn symbol
R: 22-31-41
S: 2-26-39-46
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Important Data
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Physical State; Appearance:
WHITE
POWDER
Physical Dangers:
Chemical Dangers:
The substance decomposes
on heating
producing
sulfur oxides
.
The substance is a strong reducing agent and reacts with oxidants.
Reacts
violently with
concentrated solution of sodium nitrite.
The substance decomposes
on contact with
acids
producing
sulfur oxides
.
Occupational Exposure Limits:
TLV: 5 mg/m3 as TWA; A4; (ACGIH 2002).
OSHA PEL: none
NIOSH REL: TWA 5 mg/m3
NIOSH IDLH: N.D. See: IDLH INDEX
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation
and
by ingestion.
Inhalation Risk:
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed.
Effects of Short-Term Exposure:
The substance
is irritating to
the eyes
,
the respiratory tract
and
is severely irritating to
gastrointestinal tract
.
Inhalation of the substance may cause asthma-like reactions.
Effects of Long-Term or Repeated Exposure:
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Physical
Properties
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Decomposes below melting point at 150°C
Density: 1.4
g/cm3
Solubility in water, g/100 ml: 54
good
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(
)
Octanol/water partition coefficient as log Pow: -3.7
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Environmental
Data
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The substance is harmful to aquatic organisms.
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N O T E S
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Rinse contaminated clothes (fire hazard) with plenty of water.
Anyone who has shown symptoms of asthma due to this substance should avoid all further contact.
The symptoms of asthma often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential.
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ADDITIONAL INFORMATION
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ICSC: 1461
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SODIUM DISULFITE
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(C) IPCS, CEC, 1994
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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.
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