Sodium arsenite, aqueous solution

  • Sodium metaarsenite
  • Sodium dioxoarsenate
  • Sodium m-arsenite
Formula
NaAsO2
Structure
Description
Clear solution.
Uses
The technical grade, 90-95% pure, is used in production of arsenical soap for use on skins, for treating vines against certain scale diseases.

Registry Numbers and Inventories.
CAS
7784-46-5
EC (EINECS/ELINCS)
232-070-5
RTECS
CG3675000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Reproductive Effector; Human Data
UN (DOT)
2027
Beilstein/Gmelin
48331 (G)
RCRA
D004
EPA OPP
13603
Swiss Giftliste 1
G-2566
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
AsNa3O3
Formula mass
129.91
Melting point, °C
615.0
Vapor density (air=1)
4.5
Odor Threshold Odor threshold Odorless
Density
1.87 g/cm3 (20 C)
Solubility in water
Very soluble

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container.
Handling
Wash thoroughly after handling. Wash hands before eating. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Do not ingest or inhale.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal shipping and handling conditions. Absorbs carbon dioxide from the air.
Incompatibilities
Strong oxidizing agents and strong acids.
Decomposition
Carbon monoxide, carbon dioxide, oxides of arsenic.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
This material may burn but does not ignite readily.
Hazards
When heated it emits toxic fumes of arsenic and sodium oxide. Slowly converted in solution to arsenates by atmospheric oxygen; in dry state it is decomposed by carbon dioxide.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
OSHA PEL: 1910.1018 TWA 0.010 mg/m3 NIOSH REL: Ca C 0.002 mg/m3 15-minute See Appendix A NIOSH IDLH: Potential occupational carcinogen 5 mg/m3 (as As)
Carcinogin
O, G-A1, I-1, N-1, CP65
Poison_Class
1
Exposure effects
Prolonged or repeated skin contact may cause dermatitis. May cause cancer in humans.
   Ingestion
May be fatal if swallowed. Poison by ingestion. Causes gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
Causes respiratory tract irritation.
   Skin
Causes skin irritation. May be fatal if absorbed through the skin.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately. Induce vomiting by giving one teaspoon of Syrup of Ipecac.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
2027
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
SAR
 
Std. Transport #
4923455