Sodium methylarsonate Property

Melting point:

113-116°C

Density 

1.50

form 

solid

Water Solubility 

>=10 g/100 mL at 22 ºC

EPA Substance Registry System

Monosodium methanearsonate (2163-80-6)

Safety

Hazard Codes 

Xn,N,T

Risk Statements 

22-50/53-23/25

Safety Statements 

20/21-28-45-60-61

RIDADR 

UN 1557

RTECS 

PA2625000

HazardClass 

6.1(b)

PackingGroup 

III

Hazardous Substances Data

2163-80-6(Hazardous Substances Data)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P403+P233Store in a well-ventilated place. Keep container tightly closed.

Sodium methylarsonate Chemical Properties,Usage,Production

Chemical Properties

Colorless solid or colorless to red or green solution. Odorless. Specific Gravity: (DSMA) 1.0 @ 20C; (MSMA solutions) 1.4°1.6 @ 20°C (liquid);

Chemical Properties

White solid. Very solu- ble in water.

Uses

Postemergence herbicide for grassy weeds.

Definition

The monosodiumsalt of methylarsonic acid.

General Description

Odorless colorless solid. Solution may be red or green. Solid may float or sink in water; solid and solution mix with water.

Air & Water Reactions

Water soluble.

Reactivity Profile

Sodium methylarsonate is decomposed by strong oxidizers and reducers.

Hazard

Toxic; poison.

Health Hazard

Subacute poisoning by arsenicals causes salty taste, burning in throat and stomach, and intestinal pain. Acute toxicity indicated by headache, vomiting, stupor, convulsions, paralysis. About 1 ounce to 1 pound must be taken to cause these symptoms.

Fire Hazard

Special Hazards of Combustion Products: Toxic gases may be generated in fires.

Trade name

WEED-BROOM® (DSMA+Bomacil+2,4-D); WEEDE-RAD®; WEED-S-RAD®; WEED HOE®

Safety Profile

Poison by unspecified route. Moderately toxic by ingestion. A skin and eye irritant. When heated to decomposition it emits toxic fumes of As and Na2O.

Potential Exposure

Those exposed to this organometallic, selective pesticide used for postemergence control of grasses, sedges, and weeds.

Shipping

UN2994 Arsenical pesticides, liquid, toxic, Hazard Class: 6.1; Labels: 6.1-Poisonous materials. UN3280 Organoarsenic compound, liquid, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required, Potential Inhalation Hazard (Special Provision 5).

Incompatibilities

Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Incompatible with reducing agents

Waste Disposal

Disposal of unused product must be undertaken by qualified personnel who are knowledgeable in all applicable regulations and follow all pertinent safety precautions including the use of appropriate protective equipment. For proper handling and disposal, always comply with federal, state, and local regulations.