Sorption of Am(III) on natural sediment: experiment and modeling

D. Das; Sumit Kumar; P. Pathak; B. Tomar; V. Manchanda

doi:10.1007/s10967-011-1045-7

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 289: Issue 1

Sorption of Am(III) on natural sediment: experiment and modeling

Authors:

D. Das

D. Das Advanced Fuel Fabrication Facility, Bhabha Atomic Research Centre, Tarapur, 401 504 India

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Sumit Kumar

Sumit Kumar Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085 India

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P. Pathak

P. Pathak Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085 India

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B. Tomar

B. Tomar Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085 India

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V. Manchanda

V. Manchanda Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085 India

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Pages:: 137–143

Online Publication Date:: 08 Apr 2011

Publication Date:: 01 Jul 2011

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-011-1045-7

Keywords:: Sorption; Am(III); Natural sediment; Surface complexation modeling

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Abstract

Release of long-lived radioactivity to the aquatic bodies from various nuclear fuel cycle related operations is of great environmental concern in view of their possible migration into biosphere. This migration is significantly influenced by various factors such as pH, complexing ions present in aquatic environment and sorption of species involving radionuclides on the sediments around the water bodies. ^241/243Am are two major radionuclides which can contribute a great deal to radioactivity for several thousand years. In the present study, ²⁴¹Am sorption on natural sediment collected from site near a nuclear installation in India, has been investigated under the varying conditions of pH (3–10) and ionic strength [I = 0.01–1 M (NaClO₄)]. The sorption of Am increased with pH of the aqueous medium [10% (pH 2) to ~100% (pH 10)], which was explained in terms of the increased negative surface charge on the sediment particles. There was marginal variation in Am(III) sorption with increased ionic strength (within error limits) of the aqueous medium suggesting inner-sphere complexation/sorption process. Sediment was characterized for its elemental composition and structural phases using Energy Dispersive X-Ray (SEM-EDX) and X-Ray Diffraction (XRD) techniques. Zeta-potential measurement at I = 0.1 M (NaClO₄) suggested that Point of Zero Charge (pH_PZC) was ~2, indicating the presence of silica as major component in the sediment. Kurabtov plot using sorption data as a function of pH at fixed I = 0.1 M (NaClO₄) indicated the presence of multiple Am(III) species present on the surface. Potentiometric titration of the suspension indicated the presence of mineral oxide like behavior and assuming a generic nature (≡XOH) for all types of surface sites, protonation–deprotonation constants and total number of sites have been obtained. The sorption data has been modeled using 2-pK Diffuse Double Layer Surface Complexation Model (DDL-SCM). ≡XOAm²⁺ has been identified as the main species responsible for the sorption profile.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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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)