Pu(V) as the stable form of oxidized plutonium in natural waters |
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| Institution: | 1. Moscow Lomonosov State University, Soil Science Department, Moscow, Russia, 119991;2. Saskatchewan Research Council, Saskatoon, Canada, S7N 2X8;1. Department of Physics, Andhra Loyola College, Vijayawada, Andhra Pradesh 520 008, India;2. Department of Physics, Maris Stella College, Vijayawada, Andhra Pradesh 520 008, India;3. Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Andhra Pradesh 522 510, India;1. Fuel Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;2. School of Minerals, Metallurgical and Materials Engineering, Indian Institute of Technology Bhubaneswar, Bhubaneswar 751013, India;1. A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of RAS (IPCE RAS), Leninsky Prospect 31/4, 119071, Moscow, Russia;2. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, RAS, 35 Staromonetny Lane, 119017, Moscow, Russia;1. Institute of Nuclear Physics and Chemistry, Chinese Academy of Engineering Physics, Mianyang, Sichuan 621900, China;2. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;3. Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA |
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| Abstract: | This work presents analytical evidence supporting the proposition that Pu(V) is the sole or predominant form of oxidized plutonium in natural waters. Two independent methods, the selective adsorption of Pu(VI) by silica gel, and the somewhat less selective coprecipitation of Pu(V) with calcium carbonate, were developed to separate Pu(V) from Pu(VI). Measurements of ambient plutonium in several natural waters by these methods found only Pu(V). In laboratory tracer studies, Pu(VI) was shown to be highly unstable in dilute bicarbonate solution and in Lake Michigan water, reducing in first-order fashion to Pu(V). |
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