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Reference type: Journal
Authors: Fan HT, Lu Y, Liu AJ, Jiang B, Shen H, Huang CC, Li WX
Article Title: A method for measurement of free cadmium species in waters using diffusive gradients in thin films technique with an ion-imprinted sorbent.
Publication date: 2015
Journal: Analytica Chimica Acta
Volume: 897
Page numbers: 24-33.
DOI: 10.1016/j.aca.2015.09.056
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0003267015012143

Abstract: 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 (R2 = 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
Template and target information: cadmium ion, Cd(II)
Author keywords: cadmium, Free species, ion-imprinted, Diffusive gradients in thin-films

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