Strontium and Calcium Complexation by Humic Acid

A. Paulenová; P. Rajec; M. Žemberyová; G. Sasköiová; V. Višacký

doi:10.1023/a:1006727409230

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 246: Issue 3

Strontium and Calcium Complexation by Humic Acid

Authors:

A. Paulenová

A. Paulenová Comenius University Department of Nuclear Chemistry, Faculty of Natural Sciences 842 15 Bratislava Slovak Republic

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P. Rajec

P. Rajec Comenius University Department of Nuclear Chemistry, Faculty of Natural Sciences 842 15 Bratislava Slovak Republic

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M. Žemberyová

M. Žemberyová Comenius University Department of Analytical Chemistry, Faculty of Natural Sciences 842 15 Bratislava Slovak Republic

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G. Sasköiová

G. Sasköiová Comenius University Department of Nuclear Chemistry, Faculty of Natural Sciences 842 15 Bratislava Slovak Republic

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, and

V. Višacký

V. Višacký Research Institute LIKO Bratislava Miletîcova 23 820 00 Bratislava Slovak Republic

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Pages:: 623–628

Online Publication Date:: 01 Nov 2004

Publication Date:: 17 Dec 2000

Article Category:: Research Article

DOI:: https://doi.org/10.1023/a:1006727409230

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Abstract

The binding of strontium by humic acid was studied in systems designed to model soil leaching conditions. Ultrafiltration experiments were conducted for a wide range of CaCl and NaCl concentrations and for the pH range 4 to 7. It was found that the recovery of humic acid slowly decreased with increasing pH. This occurred because at neutral and basic solutions the increasing degree of ionization of the carboxylate groups leads to the full repulsion state of the humic acid and to increasing of the strontium binding (strontium recovery 60% at pH 7) with this natural polyelectrolyte. The strontium complexation in the presence of calcium was studied in different series of metal concentrations at pH 5 and the ionic strength 0.1M NaCl. The results were explained on the base of the metal ion charge neutralization model of humic complexation (CNM). Loading capacity (cca 40%) and complexation constants and Sr (3.51±0.27) and Ca (3.10±0.29) with Aldrich humic acid were found.

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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)