The chemical form of organic radiocesium in the agricultural environment

2016 Fiscal Year Final Research Report

• Project/Area Number: 26520302
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 特設分野
• Research Field: Food Cycle Research
• Research Institution: Fukushima University
• Principal Investigator: Ohse Kenji 福島大学, うつくしまふくしま未来支援センター, 特任准教授 (90396606)
• Project Period (FY): 2014-07-18 – 2017-03-31
• Keywords: 放射性セシウム / 存在形態 / 土壌 / 河川懸濁物質 / 福島第一原発事故

Outline of Final Research Achievements

The major forms of radiocesium in soil are exchangeable, clay-bound, and organic. “Organic” radiocesium is defined as the fraction that it is not extracted by salt solution but should be solubilized by oxidative decomposition or alkali extraction. In our previous study, organic radiocesium was observed not only in soil but also in the suspended matter of streams. However, the mechanisms by which cesium ions bind with organic matter, the kinds of organic matter that bind with cesium ions, and whether cesium ions bind with organic matter at all remain unknown. In the present study, we aimed to clarify the actual chemical form of radiocesium extracted in the organic form from soil and suspended matter and the kinds of organic matter that bind with radiocesium. From dencity fractionation, chemical fractionation, and chloroform fumigation, it was suggested that most organic radiocesium was contained undecomposed organic matter including microorganism.

Free Research Field

土壌環境化学