Literature on the geochemistry of iodine is surveyed, focusing on fundamental chemical aspects which influence the migration behaviour of iodine in the terrestrial environment. It is stated that the organic fraction in soil plays the predominant role in the retention of iodine. Simple aromatic molecules serve as simple models for humic acid, and humic acid is iodinated catalyzed by haloperoxidases. The enzymatically controlled iodination of humic acid is described in detail and it is demonstrated that the results may reflect a kind of equilibrium. It is shown that soil extracts are able to catalyze the iodination of humic acid and it is suggested that extracellular peroxidases in soil are responsible for the reaction. The enzymatically controlled iodination of humic acid is discussed and some considerations about the influence on the migration of iodine in the terrestrial environment are given.
| Place of Publication | Roskilde |
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| Publisher | Risø National Laboratory |
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| Number of pages | 155 |
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| ISBN (Print) | 87-550-1615-4 |
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| Publication status | Published - 1990 |
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| Series | Risø-M |
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| Number | 2851 |
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| ISSN | 0418-6435 |
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