Selenic acid

Formula
H2SeO4
Structure
Description
A white crystalline solid.

Registry Numbers and Inventories.
CAS
7783-08-6
EC (EINECS/ELINCS)
231-979-4
RTECS
VS6575000
RTECS class
Mutagen
UN (DOT)
1905
Merck
12,8570
Beilstein/Gmelin
2267 (G)
RCRA
D010
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
H2O4Se
Formula mass
144.97
Melting point, °C
58
Boiling point, °C
260
Vapor pressure, mmHg
16 (100 C)
Density
2.951 g/cm3 (15 C)
Solubility in water
Very soluble
Surface tension
57 erg/cm2 (22 C)
Heat of fusion
14.4 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate chemical protective gloves, boots and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Neutralize spilled material with crushed limestone, soda ash, or lime.
Stability
No data.
Incompatibilities
Reacts exothermically with chemical bases (for example: amines and inorganic hydroxides) to form salts Reacts with active metals, including iron and aluminum, and also less active metals, to dissolve the metal and liberate hydrogen and/or toxic gases Reacts with cyanide salts and compounds to release gaseous hydrogen cyanide.
Decomposition
When heated to decomposition, emits toxic fumes of selenium.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Combustion products
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Health
3
 
Flammability
2
 

Health.
Exposure limit(s)
NIOSH REL*: TWA 0.2 mg/m3 OSHA PEL*: TWA 0.2 mg/m3 [*Note: PEL and REL also applies to other Se cmpds (as Se) except Selenium hexafluoride.] IDLH 1 mg/m3 (as Se)
Exposure effects
Rapid breathing and fever may be noted. Elevated blood pressure followed by significant abnormally low blood pressure and shock may be seen. Headache, restlessness, seizures or coma may be seen. No data were available to assess the teratogenic potential of this agent. <br>No data were available to assess the potential effects of exposure to this agent during pregnancy or lactation.
   Ingestion
Nausea, vomiting, diarrhea, gastrointestinal burns, and bowel infarction may develop.
   Inhalation
Pulmonary edema, pneumonitis and diaphragmatic weakness may be seen.
   Skin
Dermatitis, a red staining of the fingers, teeth and hair, dermal burns and excruciating pain may result.
   Eyes
Inflammation of the eye and corneal burns may be noted. May cause irritation of the mucous membranes or edema/erosions depending on route of exposure.

First aid
 
   Ingestion
The possible benefit of early removal of some ingested material by cautious gastric lavage must be weighed against potential complications of bleeding or perforation. Activated charcoal activated charcoal binds most toxic agents and can decrease their systemic absorption if administered soon after ingestion. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists. Treatment should include recommendations listed in the oral exposure section when appropriate.
   Eyes
Treatment should include recommendations listed in the oral exposure section when appropriate.

Transport.
UN number
1905
Response guide
Hazard class
8
Packing Group
I
 
Std. Transport #
4930035