Analytical Sciences

A Novel Hydrophobic Task Specific Ionic Liquid for the Extraction of Cd(II) from Water and Food Samples as Applied to AAS Determination

Ning LI, Guozhen FANG, Bing LIU, Jia ZHANG, Lijie ZHAO, and Shuo WANG

Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science & Technology, Tianjin 300457, P. R. China

Hydrophobic task specific ionic liquid (TSIL) functionalized 2-mercaptobenzothiazole (MBT) was synthesized and characterized by NMR and HRMS. The capability of TSIL-MBT for the selective separation and preconcentration of Cd²⁺, which was determined by flame atomic absorption spectrometry (FAAS) from water and food samples, was investigated. The TSIL-MBT with high selectivity for the extraction of Cd²⁺ was discussed by comparing with a traditional extractant, such as ammonium pyrrolidine dithiocarbamate (APDC) and diethydithiocarbamate (DDTC), and the recoveries of the extraction Cd²⁺ by TSIL-MBT were much better than APDC and DDTC. The proposed method was evaluated by analyzing two certified reference materials. The Cd²⁺ concentration, determined by the developed methodology, was in good agreement with certified values.

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