Role of fungal laccase in iodide oxidation in soils.

Previously, we hypothesized that microbial laccase oxidizes iodide (I) in soils to molecular iodine (I) or hypoiodous acid (HIO), both of which are easily incorporated into natural soil organic matter, and thus plays a role in iodine sorption on soils. In this study, soil iodide oxidase activity was determined by a colorimetric assay to evaluate if laccase is responsible for iodide oxidation in soils. Three types of Japanese soil showed significant iodide oxidase activities (0.