Association of dissolved radionuclides released by the Chernobyl accident with colloidal materials in surface water

Matsunaga, Takeshi; Nagao, Seiya*; Ueno, Takashi ; Takeda, Seiji ; Amano, Hikaru; Tkachenko, Y.*

The association of dissolved $^{90}$ Sr, $^{239,240}$ Pu and $^{241}$ Am with natural colloids was investigated in surface waters in the Chernobyl nuclear accident area by means of ultrafiltration. Results suggest that Pu and Am isotopes were preferentially associated with dissolved humic substances (HS) of high molecular size. A model calculation of the complexation of Pu and Am with HS also supported the above. This study has expanded our understanding of the general role of natural organic colloids in dictating the chemical form of actinides in the surface aquatic environment.

Language	:	English
Journal	:	Applied Geochemistry
Volume	:	19
Number	:	10
Pages	:	p.1581 - 1599
Publication Year/Month	:	2004/10
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Paper URL	:	https://doi.org/10.1016/j.apgeochem.2004.02.002
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Keywords	:	Radionuclide; Surface Water; Colloid; Organic Matter; Humic Substance; Complexation; Actinide; Ultra Filtration; Sepciation Model; Chernobyl
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Registration No. : A20030072
JAEA Abstracts No. : 320913
Paper Submission No. : 21314

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