Fig. 1
Iodine cycles from land (via erosion of rock, dissolved in water) to the ocean, where it is taken up by marine organisms and released in various organic and inorganic forms, some of which are volatized into the atmosphere, where they react with ozone (O3) and other atmospheric gases and seed the particulate matter of clouds. Movement of clouds over land re-deposits iodine dissolved in rainwater (largely as iodate, IO3– and iodide, I–), where some is taken up by soil bacteria and other terrestrial organisms and released back into the soil and into ground water (Jones and Truesdale 1984; Fuge and Johnson 1986; Truesdale and Jones 1996; Baker et al. 2000; Amachi et al. 2003; Baker 2005 also http://www.uea.ac.uk/~e780/airseaiod.htm).