期刊
ANALYTICA CHIMICA ACTA
卷 684, 期 1-2, 页码 142-146出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2010.11.002
关键词
Diffusive gradient in thin film technique; 8-Hydroxyquinoline resin gel; Uranium determination
资金
- Czech Science Foundation [AVO Z40310501, P503/10/2002]
A new resin gel based on Spheron-Oxin (R) chelating ion-exchanger with anchored 8-hydroxyquinoline functional groups was tested for application in diffusive gradient in thin film technique (DGT) for determination of uranium. Selectivity of uranium uptake from model carbonate loaded solutions of natural water was studied under laboratory conditions and compared with selectivity of the conventional Chelex 100 based resin gel. The affinity of Spheron-Oxin (R) functional groups enables determination of the overall uranium concentration in water containing carbonates up to the concentration level of 10(2) mg L(-1). The effect of uranium binding to the polyacrylamide (APA) and agarose diffusive gels (AGE) was also studied. Uranium is probably bound in both gels by a weak interaction with traces of acrylic acid groups in the structure of APA gel and with pyruvic and sulfonic acid groups in the AGE gel. These sorption effects can be eliminated to the negligible level by prolonged deployment of DGT probes or by disassembling probes after the 1-2 days post-sampling period that is sufficient for release of uranium from diffusive gel and its sorption in resin gel. (C) 2010 Elsevier B.V. All rights reserved.
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