Agent Name

Dimethylarsenic acid

Alternative Name

Cacodylic acid

CAS Number




Major Category



Arsinic acid, dimethyl-; Acide cacodylique [French]; Acide dimethylarsenique [French]; Acide dimethylarsinique [French]; Agent Blue; Alkargen; Ansar 138; Arsan; Cacodylic acid; Chexmate; Cotton aide HC; Dilic; Dimethylarsenic acid; Dimethylarsinic acid; Erase; Hydroxydimethylarsine oxide; Kyselina kakodylova [Czech]; Moncide; Phytar; Phytar 138; Phytar 560; Phytar 600; Rad-E-Cate 35; Salvo; Silvisar; Silvisar 510; Sylvicor; [ChemIDplus] UN1572


Arsenic Compounds, Organic


Hygroscopic solid; [Merck Index] Colorless odorless hygroscopic solid; [CAMEO] White crystalline solid; [MSDSonline]


Used as a herbicide; [Sullivan, p. 981] Used as a drug (dermatological and veterinarian); [Merck Index] Used as a preharvest desiccant, a soil sterilant, a chemical warfare agent, a timber thinning defoliant, and a sugarcane ripener; [HSDB] Used as a defoliant and herbicide registered to control weeds under non-bearing citrus trees, around buildings, and for lawn renovation; [Reference #1]


"There is sufficient evidence in experimental animals for the carcinogenicity of dimethylarsenic acid. . . . Arsenic in drinking-water is carcinogenic to humans (Group 1)." [IARC] A forestry worker injecting trees with silvicide containing cacodylic acid developed anorexia, nausea, and abdominal pain; He had elevated urine arsenic, and symptoms subsided after termination of exposure; [HSDB] Essentially non-irritating in contact with skin and eyes; [CHRIS] Not converted into inorganic arsenic in the body; [Nordberg, p. 590] Most excreted unchanged; [Rosenstock, p. 947]

Reference Link

EPA Pesticide Chemical Search

Exposure Assessment
Vapor Pressure

1.0E-7 mm Hg

Lethal Concentration

LCLo (rat) = 4,900 mg/m3/4h

Adverse Effects
IARC Carcinogen

Possible Carcinogen

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


Chemical Information

Search ChemIDplus

Related Information in HazMap

Industrial Processes with risk of exposure: