Sodium metaarsenite

Sodium Metaarsenite

Sodium metaarsenite is an inorganic compound with the chemical formula NaAsO₂. It is a salt derived from arsenous acid and is known for its use in various industrial and medical applications. Sodium metaarsenite is a white, crystalline solid that is soluble in water and has been historically used as a pesticide and herbicide.

Chemical Properties

Sodium metaarsenite is composed of sodium (Na), arsenic (As), and oxygen (O). The compound is typically formed by the reaction of arsenic trioxide (As₂O₃) with sodium hydroxide (NaOH). The resulting compound is a sodium salt of arsenous acid.

Molecular Structure

The molecular structure of sodium metaarsenite consists of a central arsenic atom bonded to two oxygen atoms, forming an arsenite ion (AsO₂^-). The sodium ion (Na⁺) balances the charge of the arsenite ion, resulting in the neutral compound NaAsO₂.

Uses

Sodium metaarsenite has been used in various applications, including:

• Pesticide and Herbicide: Historically, sodium metaarsenite was used as a pesticide and herbicide due to its toxic properties. It was effective in controlling weeds and pests in agricultural settings.

• Medical Applications: In the past, sodium metaarsenite was used in some medical treatments, particularly in the treatment of certain parasitic infections. However, due to its toxicity, its use in medicine has been largely discontinued.

• Industrial Applications: Sodium metaarsenite is used in some industrial processes, including the manufacturing of glass and ceramics.

Toxicity and Safety

Sodium metaarsenite is highly toxic and poses significant health risks if ingested, inhaled, or absorbed through the skin. It is classified as a carcinogen and can cause various health issues, including skin lesions, respiratory problems, and an increased risk of cancer.

Handling and Disposal

Due to its toxicity, sodium metaarsenite must be handled with care. Appropriate personal protective equipment (PPE) such as gloves, masks, and protective clothing should be worn when handling the compound. Disposal of sodium metaarsenite must comply with local environmental regulations to prevent contamination of soil and water sources.

Regulation

The use of sodium metaarsenite is regulated in many countries due to its toxic nature. It is important to adhere to safety guidelines and regulations when using or disposing of this compound.

Also see

• Arsenic trioxide
• Arsenous acid
• Pesticides
• Toxicology