期刊
ANALYTICA CHIMICA ACTA
卷 897, 期 -, 页码 24-33出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2015.09.056
关键词
Cadmium; Free species; Ion-imprinted; Diffusive gradients in thin-films
资金
- National Natural Science Foundation of China [21107076, 21477082]
- program for Liaoning Excellent Talents in University of China [LR2015050]
A diffusive gradients in thin films (DGT) device for the analysis of free Cd(II) species, based on Cd(II) ion-imprinted sorbent (IIS) as the binding agents and commercial polyethersulfone membrane (PES) as diffusion layer, was developed (PES/IIS-DGT). DGT time-series experiments showed that the mass of free Cd(II) species accumulated by PES/IIS-DGT was linear vs. time (R-2 = 0.9953) and the concentration of free Cd(II) species by PES/IIS-DGT was in good agreement with the total dissolved concentrations of free Cd(II) species in simple synthetic solutions where free ionic species dominated. PES/IIS-DGT performance was independent in the range of pH 4.5-7.5 and ionic strength range from 1.0 x 10(-3) to 0.7 mol L-1. The measurement of free Cd(II) species in synthetic solution containing different concentrations of ligands by PES/IIS-DGT showed an excellent agreement with the value measured by Cd(II) ion selective electrodes (Cd-ISE), indicating that PES/IIS-DGT method is more suitable than Cd-ISE for the measurement of low concentration of free Cd(II) species due to the enrichment of IIS for the analytes. (C) 2015 Elsevier B.V. All rights reserved.
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