Simultaneous determination of plutonium and americium in soils by extraction chromatography |
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Authors: | J Jia C Testa D Desideri M A Meli |
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Institution: | (1) Institute of General and Inorganic Chemistry, University of Urbino, Italy;(2) Present address: Institute of Atomic Energy, Beijing, China |
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Abstract: | A radiochemical method is described for the determination of238Pu,239(240)Pu and241Am in a single soil sample. Plutonium is separated from a HNO3 leaching solution by a Microthene-TNOA column; amcricium is coprecipitated by oxalic acid, decontaminated from polonium by a TNOA-column in HCl medium, separated from the rare earth elements by a Microthene-HDEHP column, eluted with a 0.07M DTPA+1M lactic acid solution and finally purified by a PMBP-TOPO extraction. The method supplies a good decontamination of Am and Pu from natural alpha emitters; starting from 50 g soil, the average yields were 75.1±13.4% for plutonium and 57.7±10.8% for Am.239(240)Pu,238Pu and241Am concentrations (mBq/kg) in three different kinds of soil were the following: 255, 10.4, 81.3 (uncultivated soils); 236, 11.6, 76.7 (cultivated soils); 46, 1.9, 19.8 (river sediment). The average ratios238Pu to239(240)Pu and241Am to239(240)Pu were 0.044 and 0.350, respectively. |
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