Authors:
H. Shin Korea Advanced institute of Science and Technology Department of Chemistry 373-1 Kusong-dong, Yusong-ku 305-701 Taejon (Korea)

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B. Lee Korea Advanced institute of Science and Technology Department of Chemistry 373-1 Kusong-dong, Yusong-ku 305-701 Taejon (Korea)

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H. Yang Korea Atomic Energy Research Institute P.O. Box 105 353-606 Taejon (Korea)

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S. Yun Chungnam National University Department of Chemistry 305-764 Taejon (Korea)

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H. Moon
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Abstract  

Complexation of trivalent europium by a well characterized soil fulvic acid was investigated by equilibrium dialysis titration method ([FA]=24 mg·dm–3, [Eu]t=9.0·10–7–3.5·10–6 mol·dm–3, pH 6.0). The concentrations of the fulvate bound and free europium were measured radiometrically using152Eu as a tracer. The experimental results were evaluated using a bimodal normal distribution model and a plot with two overlapping normal distributions was obtained which gave two means logKI=7.0, I=1.1; µII=4.9, II=0.5) values for binding of europium by two classes of sites in fulvic acid. A multiligand model was assumed for fulvic acid, based upon the Eu(III) luminescence studies (7F05D0 excitation) on many organic acids as model ligands.

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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)