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Solid phase ligand-less extraction of cadmium(II) using a silica gel modified with an amino-functionalized ionic liquid

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Abstract

A method was developed for the determination of cadmium(II) by ligand-less solid phase extraction that is based on the direct retention of Cd(II) in a mini-column filled with a silica gel modified with an amino-functionalized ionic liquid. The effects of pH, sample volume and its flow rate, eluent concentration and its volume, the flow rate of eluent, and of potential interferences on extraction and desorption were optimized. Following its determination by electrothermal atomic absorption spectrometry, the detection limit for Cd(II) is 8.9 ng L−1, and the relative standard deviation is 2.3 % (at 1.0 ng mL−1; for n = 5). The method was applied to the analysis of Cd(II) in a certified reference material (laver; GBW10023), and the recoveries ranged from 97.0 to104.0 %

◆ Amino-functionalized ionic liquid modified silica gel (NH2-IL/SG) obtained a better absorption for Cd(II) than bare silica gel in the tested pH range due to electrostatic interaction between amino groups and Cd(II).

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Acknowledgments

National Natural Science Foundation of China (21155001, 21375117), Foundation of the Priority Academic Program Development of Jiangsu Higher Education Institutions and Technology Invention Team in Yangzhou University, and Graduate Innovation Project Foundation of Jiangsu Province (CXLX12-0908) are gratefully acknowledged for financial support.

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Authors and Affiliations

  1. College of Chemistry & chemical Engineering, Yangzhou University, Yangzhou, 225002, People’s Republic of China

    Shengping Wen, Xiashi Zhu, Qingli Huang, Wei Xu & Nan Zhou

  2. Department of Pharmacy, Zhengzhou Huaxin University, Zhengzhou, 451100, People’s Republic of China

    Haijuan Wang

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  1. Shengping Wen
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Correspondence to Xiashi Zhu.

Appendix A. Supplementary data

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Wen, S., Zhu, X., Huang, Q. et al. Solid phase ligand-less extraction of cadmium(II) using a silica gel modified with an amino-functionalized ionic liquid. Microchim Acta 181, 1041–1047 (2014). https://doi.org/10.1007/s00604-014-1212-y

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