Green choline amino acid ionic liquids aqueous two-phase extraction coupled with synchronous fluorescence spectroscopy for analysis naphthalene and pyrene in water samples

Qi Li; Wei Liu; Xiashi Zhu

doi:10.1016/j.talanta.2020.121305

Green choline amino acid ionic liquids aqueous two-phase extraction coupled with synchronous fluorescence spectroscopy for analysis naphthalene and pyrene in water samples

Talanta. 2020 Nov 1:219:121305. doi: 10.1016/j.talanta.2020.121305. Epub 2020 Jul 1.

Authors

Qi Li¹, Wei Liu¹, Xiashi Zhu²

Affiliations

¹ College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou University, Yangzhou, 225002, PR China.
² College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou University, Yangzhou, 225002, PR China; College of Guangling, Yangzhou University, Yangzhou University, Yangzhou, 225002, PR China. Electronic address: xszhu@yzu.edu.cn.

PMID: 32887046
DOI: 10.1016/j.talanta.2020.121305

Abstract

A novel aqueous two-phase extraction method has been established for the determination of polycyclic aromatic hydrocarbons in water sample. This method was based on the extraction of naphthalene and pyrene from water by means of choline amino acid ionic liquids aqueous two-phase system and their determination by synchronous fluorescence spectroscopy. In synchronous fluorescence spectroscopy, the fluorescence peaks of naphthalene and pyrene were completely separated to meet the requirement of simultaneous determination. For this method, good linear calibration curves of naphthalene and pyrene were obtained in the range of 0.50-10.0, 0.05-5.0 μg mL^-1, respectively, and limits of detection were 0.211, 0.012 μg mL^-1, respectively. The proposed method was successfully applied for the simultaneous determination of naphthalene and pyrene in water samples, which was considered as an excellent green analysis according Analytical Eco-Scale.

Keywords: Amino acid ionic liquids; Aqueous two-phase; Choline chloride; PAHs; Synchronous fluorescence spectroscopy.