International Chemical Safety Cards

SELENIOUS ACID

ICSC: 0945

SELENIOUS ACID
Monohydrated selenium dioxide
Selenous acid
H₂SeO₃
Molecular mass: 129.0
CAS # 7783-00-8
RTECS # VS7175000
ICSC # 0945
UN # 2811
EC # 034-002-00-8

TYPES OF HAZARD/ EXPOSURE	ACUTE HAZARDS/ SYMPTOMS	PREVENTION	FIRST AID/ FIRE FIGHTING
FIRE	Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.		In case of fire in the surroundings: all extinguishing agents allowed.
EXPLOSION

EXPOSURE		PREVENT DISPERSION OF DUST! STRICT HYGIENE!
INHALATION	Burning sensation. Cough. Laboured breathing. Sore throat.	Local exhaust or breathing protection.	Fresh air, rest. Half-upright position. Refer for medical attention.
SKIN	MAY BE ABSORBED! Redness. Pain. Blisters.	Protective gloves. Protective clothing.	Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
EYES	Redness. Pain. Blurred vision. Severe deep burns. Puffy eyelids.	Face shield or eye protection in combination with breathing protection.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
INGESTION	Abdominal pain. Burning sensation. Confusion. Nausea. Sore throat. Weakness. Low blood pressure.	Do not eat, drink, or smoke during work.	Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Give plenty of water to drink. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Evacuate danger area! Consult an expert! Cover spillage with dry lime or soda ash, pick up and sweep spilled substance into closed containers, then remove to safe place (extra personal protection: complete protective clothing including self-contained breathing apparatus).

Separated from strong reducing agents, food and feedstuffs. Cool. Dry. Keep in a well-ventilated room.

Airtight. Do not transport with food and feedstuffs.
T symbol
R: 23/25-33
S: 20/21-28-44
Note: A
UN Hazard Class: 6.1
UN Packing Group: I

SEE IMPORTANT INFORMATION ON BACK

ICSC: 0945

Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

International Chemical Safety Cards

SELENIOUS ACID

ICSC: 0945

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PHYSICAL STATE; APPEARANCE:
COLOURLESS DELIQUESCENT CRYSTALS.

PHYSICAL DANGERS:

CHEMICAL DANGERS:
The substance decomposes on heating producing water and toxic fumes of selenium oxides. Reacts on contact with acids producing toxic gaseous hydrogen selenide.

OCCUPATIONAL EXPOSURE LIMITS (OELs):
TLV (as Se): ppm; 0.2 mg/m³ (ACGIH 1990-1991).
PDK (as Se): 0.1 mg/m³ (USSR 1978).

ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion.

INHALATION RISK:
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly by dispersion.

EFFECTS OF SHORT-TERM EXPOSURE:
Corrosive. The substance is corrosive to the eyes, the skin and the respiratory tract. The substance may cause effects on the eyes , resulting in allegic-type reaction of the eyelids (rose-eye). Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact with skin may cause dermatitis. Nasopharyngeal irritation, gastrointestinal distress and persistent garlic odour may occur.

PHYSICAL
PROPERTIES

Decomposes below melting point at 70°C
Relative density (water = 1): 3.004 at 15°C

Solubility in water: very good (167 g/100 ml at 20°C)
Vapour pressure, Pa at 15°C: 266

ENVIRONMENTAL
DATA

NOTES

The following symptoms in long-term exposure may occur: paleness, coated tongue, stomach disorders, nervousness, metallic taste and garlic odour of the breath. Do NOT take working clothes home. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state.

Transport Emergency Card: TEC (R)-61G09

IMPORTANT LEGAL NOTICE:

Neither the CEC or the IPCS nor any person acting on behalf of 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.