Naturally Occuring Organohalogen Compounds — A Comprehensive Survery
Natural chlorine-, bromine-, iodine-, and fluorine-containing organic chemical compounds are abundant on our planet. Occurring on land, in the oceans, and in the atmosphere, they pervade every form of life. They are produced by marine and terrestrial plants, bacteria, fungi, insects, marine animals, and even mammals. Natural combustion processes, such as volcanoes and other geothermal events, and forest and brush fires contribute large quantities of halogenated compounds to the environment. In 40 years, the number of known natural organohalogens has multiplied 200 times, from a dozen in 1954 to nearly 2400 today (Table 1) (1–12).