Endosulfan in the environment

Endosulfan in the environment

Endosulfan breaks down into endosulfan sulfate and endosulfan diol, both of which, according to the EPA, have "structures similar to the parent compound and are also of toxicological concern…The estimated half-lives for the combined toxic residues (endosulfan plus endosulfan sulfate) [range] from roughly 9 months to 6 years." The EPA concluded that, "[b]ased on environmental fate laboratory studies, terrestrial field dissipation studies, available models, monitoring studies, and published literature, it can be concluded that endosulfan is a very persistent chemical which may stay in the environment for lengthy periods of time, particularly in acid media." The EPA also concluded that "[e]ndosulfan has relatively high potential to bioaccumulate in fish."It is also toxic to amphibians: low levels have been found to kill tadpoles. 

Endosulfan is subject to long range atmospheric transport, i.e. it can travel long distances from where it is used. For example, a 2008 report by the National Park Service found that endosulfan commonly contaminates air, water, plants and fish of national parks in the U.S. Most of these parks are far from areas where endosulfan is used. Endosulfan has also been detected in dust from the Sahara Desert collected in the Caribbean after being blown across the Atlantic Ocean.
In 2009, the committee of scientific experts of the Stockholm Convention concluded that "endosulfan is likely, as a result of long range environmental transport, to lead to significant adverse human health and environmental effects such that global action is warranted."