Speciation of astatine reacted with oxidizing and reducing reagents by thin layer chromatography: formation of volatile astatine
Radio-chromatography was conducted by using the astatine radionuclides 209,210,211At produced in the 7Li induced reaction of 209Bi. The speciation of dissolved astatine chemical species of astatide (At−), astatate (AtO3−) and perastatate (AtO4−) was carried out by thin layer chromatography on silica gel with an ethanol/water solution. Amounts of the astatine species varied with concentrations of oxidizing and reducing reagents, potassium periodate, sodium sulfate and hydrazine hydrate. The oxidation–reduction reactions between At−(−I) and AtO3− (V) were found to form volatile At0 (0) and release it from a silica gel thin layer in the development.
KeywordsAstatine anions Thin layer chromatography Oxidation and reduction degree Volatility of At0
The authors thank the crew of the JAEA Tandem Accelerator for accelerator operation. We are thankful to Dr. M. Asai for his help for γ-ray and α-ray spectroscopies and H. Saeki for visualizing imaging plates by BAS. This work was supported by JSPS KAKENHI Grant Numbers JP2360013, JP15K04741 and JP18K11939.
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