Institute for Environmental Sciences, Obuchi, Rokkasho-mura, Kamikita, Aomori, Japan.
Radiat Prot Dosimetry. 2022 Sep 9;198(13-15):1189-1195. doi: 10.1093/rpd/ncac149.
This study aimed to evaluate the effect of rice plant root activity on the chemical form of stable iodine (I) in a cultivated soil solution. Concentrations of I-, IO3- and organic-I were analyzed 4 days after exposure I- or IO3- solutions to each of the cultivated soil surface. When exposed to I-, its concentration in the cultivated soil was approximately the same as that in the non-planted soil. When the rhizosphere was exposed to IO3-, the I- concentration in the soil increased under cultivation conditions. IO3- remained undetected in the soil solution. The organic-I concentration in the cultivated soil solution was higher than that in the non-cultivated soil. Concentrations of organic-I increased under IO3- addition compared to I- addition. A weak positive correlation was observed between the TTC-reducing activity of plant roots, and the total and organic-I concentrations in the soil solution. It was suggested that the amount of organic I formed from IO3- was determined by the reducing activity of the roots.
本研究旨在评估水稻根系活性对土壤溶液中稳定碘（I）化学形态的影响。在暴露于 I-或 IO3-溶液后 4 天，分析了每种栽培土壤表面的 I-、IO3-和有机-I 的浓度。当暴露于 I-时，其在栽培土壤中的浓度与非种植土壤中的浓度大致相同。当根际暴露于 IO3-时，在栽培条件下土壤中 I-的浓度增加。在土壤溶液中未检测到 IO3-。在栽培土壤溶液中的有机-I 浓度高于非栽培土壤中的浓度。与添加 I-相比，添加 IO3-后有机-I 的浓度增加。在土壤溶液中，植物根系的 TTC 还原活性与总有机-I 浓度之间存在弱正相关。这表明由 IO3-形成的有机 I 的量取决于根的还原活性。
