title: Inorganic iodine incorporation into soil organic matter: evidence from iodine K-edge X-ray absorption near-edge structure.
abstract: The transformation of inorganic iodine (I(-) and IO(3)(-)) incubated in soils with varying amounts of organic matter (Andosols from the surface layer of an upland field and forest, as well as Acrisols from surface and subsurface layers of an upland field) was investigated by using the iodine K-edge X-ray absorption near-edge structure (XANES). After 60d of reaction, both I(-) and IO(3)(-) were transformed into organoiodine in surface soils containing sufficient amounts of organic matter, whereas IO(3)(-) remained unchanged in the subsurface soil of Acrisols with low organic matter contents. Transformation of IO(3)(-) into organoiodine was not retarded when the microbial activity in soil was reduced by gamma-ray irradiation, suggesting that microbial activity was not essential for the transformation of inorganic iodine into organoiodine. Soil organic matter has the ability to transform inorganic iodine into organoiodine.
authors.affiliation: National institute for agro-environmental sciences, 3-1-3 Kan-non-dai, Tsukuba, Ibaraki 305-8604, Japan. nyamag@affrc.go.jp
authors.forename: Noriko
authors.initials: N
authors.lastname: Yamaguchi
authors.forename: Masashi
authors.initials: M
authors.lastname: Nakano
authors.forename: Rieko
authors.initials: R
authors.lastname: Takamatsu
authors.forename: Hajime
authors.initials: H
authors.lastname: Tanida
mesh_terms: D004784:Environmental Monitoring; D007455:Iodine / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D056928:X-Ray Absorption Spectroscopy / Q000379:methods*
chemical_list: D012987:Soil; D007455:Iodine