Methylarsonic

Methylarsonic is a chemical compound that belongs to the organoarsenic family. Its chemical formula is CH5AsO2. It is an inorganic arsenic derivative where one hydrogen atom of arsenous acid (H3AsO3) is replaced by a methyl group. Methylarsonic acid is the most common form, existing as a solid at room temperature. It is soluble in water and organic solvents.

This compound can be found in the environment, often as a result of the degradation of other organoarsenic compounds, such as those used in pesticides and herbicides. It can also be formed through natural biological methylation processes involving inorganic arsenic. Methylarsonic is considered a toxic substance, though its toxicity varies depending on the specific form and the route of exposure. Ingestion or inhalation can lead to adverse health effects.

Historically, organoarsenic compounds, including those related to methylarsonic, have been used in various applications, including as veterinary medicines, feed additives, and pest control agents. However, due to toxicity concerns, many of these uses have been phased out or are heavily regulated in many parts of the world. Environmental monitoring for methylarsonic and other arsenic species is important due to the persistence and potential bioaccumulation of arsenic in ecosystems.