Authors:
Y. Ohtsuka Department of Radioecology, Institute for Environmental Sciences Rokkasho, Aomori 039-3212, Japan

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M. Yamamoto Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University Wake, Nomi-shi, Ishikawa 923-1224, Japan

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Y. Takaku Department of Radioecology, Institute for Environmental Sciences Rokkasho, Aomori 039-3212, Japan

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S. Hisamatsu Department of Radioecology, Institute for Environmental Sciences Rokkasho, Aomori 039-3212, Japan

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J. Inaba Department of Radioecology, Institute for Environmental Sciences Rokkasho, Aomori 039-3212, Japan

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Summary  

A rapid method was developed using ultrafilters with a tangential flow filtering system for molecular size separation of naturally occurring 210Pb and 210Po in a freshwater sample. Generally, ultrafiltering of a large volume water sample for measuring the nuclides was too time consuming and not practical. The tangential flow filtering system made the filtering time short enough to adapt for in-situ ultrafiltering the large volume sample. In this method, a 20 liter water sample was at first passed through the 0.45mm pore size membrane filter immediately after sample collection to obtain suspended particle matter [>0.45mm particulate fraction (PRT)]. Two ultrafilters (Millipore Pellicon 2Ò) were used sequentially. The nuclides in the filtrate were separated into three fractions: high molecular mass (100 kDa-0.45mm; HMM), low molecular mass (10 k-100 kDa; LMM) and ionic (<10 kDa; INC) fractions. It took 80 minutes to process the sample after collection. The cut-off molecular size of each ultrafilter was confirmed by size exclusion chromatographs (SEC) of the LMN and the HMM fractions. Adsorption of the nuclides and organic compounds in the sample onto the ultrafilters was negligibly small. Good reproducibility of the nuclide concentrations in each fraction was confirmed by repeated experiments. The method was successfully applied to obtaine the molecular size distributions of 210Pb and 210Po in an oligotrophic lake, Lake Towada located in the northern area of Japan.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)