@article{oai:repo.qst.go.jp:00043714,
 author = {Ishii, Nobuyoshi and Tagami, Keiko and Uchida, Shigeo and 石井 伸昌 and 田上 恵子 and 内田 滋夫},
 issue = {8},
 journal = {Chemosphere},
 month = {Nov},
 note = {The behavior of an element in the environment depends on its physicochemical form. Basic data for the behavior of technetium in an agricultural environment were obtained by determining the physicochemical forms of Tc in 28 surface water samples from paddy and upland fields. Most of the 95mTc was present as TcO4 in the samples. The relative amount of this chemical form was 72% on average. A significant amount of insoluble Tc (particles more than 0.2lm in size), however, was found in some samples. The maximum amount of the insoluble Tc was 91%. Other forms were found in insignificant amounts. The amount of insoluble Tc was relatively high in paddy soil samples. Paddy soils, gley soils and gray lowland soils were particularly effective in the insolubilization of Tc. Among the soil characteristics studied, cation exchange capacity, anion exchange capacity, and active aluminum showed significant correlations with the relative amount of insoluble Tc. When microorganisms were eliminated from the surface water samples before the addition of 95mTcO4 , little insoluble Tc was found, suggesting that microorganisms cause the physicochemical trans-formation. These results showed that the physicochemical form of Tc changes from TcO4 to insoluble forms in surface water covering paddy fields. The insoluble forms would restrict the mobility of Tc in paddy fields.},
 pages = {953--959},
 title = {Physicochemical forms of technetium in surface water covering paddy and upland fields},
 volume = {57},
 year = {2004}
}