MSMA, also known as monosodium methanearsonate, is a commonly used herbicide in the gardening and landscaping industry. However, it has been banned for residential use due to its potential health and environmental risks. The Environmental Protection Agency (EPA) has imposed strict restrictions on the use of MSMA in order to protect human health and prevent contamination of drinking water sources.
One of the main reasons for the ban on MSMA for residential use is its potential to contaminate drinking water. Organic arsenicals like MSMA can convert over time to inorganic arsenic in soil, which is a more toxic form. When this contaminated soil is subjected to runoff, it can enter water bodies and contaminate drinking water sources. Inorganic arsenic is a known carcinogen and can have serious health effects when consumed in high concentrations over a long period of time.
To prevent exposure to inorganic arsenic in drinking water, the EPA has implemented restrictions on the use of MSMA. These restrictions include prohibiting the use of MSMA on residential turf, including lawns and home gardens. This ensures that the potential for runoff and contamination of drinking water sources is minimized.
In addition to the risk of water contamination, MSMA also poses health risks to those who apply it. As an herbicide, MSMA is designed to kill weeds and unwanted vegetation. However, it can also harm beneficial plants and organisms if not used properly. The EPA has recognized the potential for exposure to MSMA through inhalation, skin contact, and ingestion, and has deemed it necessary to restrict its use to protect the health of those who handle and apply the product.
Furthermore, there have been concerns about the persistence of MSMA in the environment. It has been found to have a long half-life in soil, meaning that it can remain active and potentially harmful for an extended period of time. This persistence increases the risk of accumulation in the environment and potential impacts on ecosystems.
It is important to note that while MSMA is banned for residential use, it may still be allowed for certain commercial or agricultural applications. This is because these uses may have stricter regulations and guidelines in place to minimize the risks associated with its use.
MSMA is banned for residential use due to its potential to contaminate drinking water sources with inorganic arsenic, its health risks to those who handle and apply it, and its persistence in the environment. The restrictions imposed by the EPA aim to protect human health and the environment by minimizing exposure to this herbicide.
