ChemicalBook CAS DataBase List 7784-46-5

7784-46-5

Name	Sodium m-arsenite
CAS	7784-46-5
EINECS(EC#)	231-148-6
Molecular Formula	AsO2.Na
MDL Number	MFCD00085309
Molecular Weight	129.91
MOL File	7784-46-5.mol

Chemical Properties

Appearance	Sodium arsenite is a white or grayish-white powder or flakes.
Melting point	817 °C(lit.)
Boiling point	613 °C(lit.)
density	5.727 g/mL at 25 °C(lit.)
storage temp.	Store at +15°C to +25°C.
solubility	H₂O: soluble
form	powder
color	off-white to gray
PH	9.3 (H2O, 20°C)
Stability:	Stable. Incompatible with strong oxidizing agents, strong acids. Protect from moisture. Absorbs carbon dioxide from air.
Water Solubility	Miscible with water. Slightly miscible with alcohol.
Merck	13,8651
EPA Substance Registry System	Sodium arsenite (7784-46-5)

Safety Data

Hazard Codes	T,N
Risk Statements	23/25-50/53-51/53-45-52/53-22-23/24/25-21-34 less more
Safety Statements	20/21-28-45-60-61-53-36/37-36/37/39-26 less more
RIDADR	UN 1558 6.1/PG 2
WGK Germany	3
RTECS	CG0525000
F	10
TSCA	Yes
HazardClass	8
PackingGroup	III
HS Code	28429090
Safety Profile	Confirmed human carcinogen. Human poison by ingestion. Experimental poison by ingestion, skin contact, intravenous, intramuscular, and intraperitoneal routes. An experimental teratogen. Experimental reproductive effects. Human mutation data reported. Used as an herbicide and pesticide. When heated to decomposition it emits toxic fumes of arsenic and NazO. See also ARSENIC COMPOUNDS. less more
Hazardous Substances Data	7784-46-5(Hazardous Substances Data)
Toxicity	LD50 orally in rats: 0.041 g/kg (Smyth) less more

Hazard Information

Chemical Properties

white granular crystals

Definition

ChEBI: An inoganic sodium salt with formula with formula NaAsO2.

Uses

Technical grade in manufacture of arsenical soap for use on skins, for treating vines against certain scale diseases; as insecticide especially for termites.

General Description

A white or grayish-white powder. Denser than water. Contact may irritate skin, eyes and mucous membranes. May be toxic by ingestion, inhalation and skin absorption.

Air & Water Reactions

Soluble in water. Slowly converted in solution to arsenates by atmospheric oxygen; in dry state Sodium m-arsenite is decomposed by carbon dioxide. [EPA, 1998].

Reactivity Profile

Salts, basic, such as SODIUM ARSENITE, are generally soluble in water. The resulting solutions contain moderate concentrations of hydroxide ions and have pH's greater than 7.0. They react as bases to neutralize acids. These neutralizations generate heat, but less or far less than is generated by neutralization of the bases in reactivity group 10 (Bases) and the neutralization of amines. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible.

Health Hazard

Extremely toxic: probable oral lethal dose (human) 5-50 mg/kg, between 7 drops and one teaspoon for 70 kg person (150 lb.). Poisonous if swallowed or inhaled. Human suspected carcinogen.

Fire Hazard

Sodium m-arsenite may burn but does not ignite readily. When heated Sodium m-arsenite emits toxic fumes of arsenic and sodium oxide. Slowly converted in solution to arsenates by atmospheric oxygen; in dry state Sodium m-arsenite is decomposed by carbon dioxide.

Hazard

Toxic by ingestion and inhalation.

Potential Exposure

This material is used in manufacturing of arsenical soap for use on skin; treating vines against certain scale diseases; wood preservation; as a reagent in preparation of Methylene iodide; corrosion inhibitor; and for herbicidal and pesticidal purposes

First aid

Move victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give 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. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of exposure (inhalation, ingestion, or skin contact) to substance may be delayed. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy. Antidotes and Special Procedures: For severe poisoning, BAL has been used. For milder poisoning penicillamine (not penicillin) has been used, both with mixed success. Side effects occur with such treatment and it is never a substitute for controlling exposure. It can only be done under strict medical care.

Shipping

UN2027 Sodium arsenite, solid, Hazard Class: 6.1; Labels: 6.1-Poisonous materials. UN1686 Sodium arsenite, aqueous solutions, Hazard Class: 6.1; Labels: 6.1-Poisonous materials.

Incompatibilities

Chemically active metals. Arsine, a very deadly gas, can be released in the presence of acid, acid mists, or hydrogen gas.

Waste Disposal

The arsenic may be precipitated as calcium arsenite. It should be stored until recycled. In accordance with 40CFR165, follow recommendations for the disposal of pesticides and pesticide containers. Must be disposed properly by following package label directions or by contacting your local or federal environmental control agency, or by contacting your regional EPA office.

Spectrum Detail

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