Citation: ZHANG Wenhui, JIANG Tingfu, LÜ Zhihua, WANG Yuanhong. On-line coupling of ionic liquid-based single-drop microextraction and capillary electrophoresis for determination of three bromophenols in water samples[J]. Chinese Journal of Chromatography, ;2013, 31(7): 656-660. doi: 10.3724/SP.J.1123.2013.05050 shu

On-line coupling of ionic liquid-based single-drop microextraction and capillary electrophoresis for determination of three bromophenols in water samples

1.
School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China

Corresponding author: JIANG Tingfu,
Received Date: 30 May 2013

Fund Project: 国家自然科学基金项目(31171665) (31171665)山东省自然科学基金项目(ZR2011BM004) (ZR2011BM004)中国海洋大学海洋药物教育部重点实验室开放基金项目(KLMD(OUC)201205). (KLMD(OUC)201205)

An ionic liquid-based single-drop microextraction (IL-SDME) procedure using IL as an extractant on-line coupled to capillary electrophoresis (CE) is proposed. The method is capable of quantifying trace amounts of bromophenols in water samples. The extraction parameters such as extraction solvent, extraction time, ionic liquid single-drop volume, ionic strength and organic solvent were systematically investigated. For the SDME of the three bromophenols, a [C₄MIM]PF₆] microdrop was exposed for 8 min to the aqueous sample with 10% (w/w) NaCl and then was directly injected into a capillary column for analysis. Under the optimal conditions, good linear relationships were obtained in the concentration range of 1-100 mg/L with the correlation coefficients of 0.9939-0.9988 for the bromophenols. The detection limits of the three bromophenols were 0.3 mg/L. The RSDs of peak areas of the standards were 5.21%-6.47% (n=6). And the enrichment factors for the three bromophenols were 115.8, 327.0 and 569.8. The proposed method was applied to the determination of the three bromophenols in tap, river and lake waters with the recoveries of the three bromophenols in the range of 87.8%-96.7%. The method is suitable for the quantification of bromophenols in water samples.
- ionic liquid,
- single-drop microextraction,
- capillary electrophoresis (CE),
- on-line coupling,
- bromophenols,
- water
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沈阳化工大学材料科学与工程学院沈阳 110142