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Molecules 2015, 20(12), 22137-22145; doi:10.3390/molecules201219842

Development of an Analytical Method Based on Temperature Controlled Solid-Liquid Extraction Using an Ionic Liquid as Solid Solvent

1
School of Chemical and Biological Science, Quanzhou Normal University, Quanzhou, 362000, China
2
Hengxing Energy Saving Technology Company Limited of Quanzhou, Fujian 362000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 5 August 2015 / Revised: 29 October 2015 / Accepted: 19 November 2015 / Published: 10 December 2015
(This article belongs to the Special Issue Ionic Liquids in Organic Synthesis)
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Abstract

At the present paper, an analytical method based on temperature controlled solid-liquid extraction (TC-SLE) utilizing a synthesized ionic liquid, (N-butylpyridinium hexafluorophosphate, [BPy]PF6), as solid solvent and phenanthroline (PT) as an extractant was developed to determine micro levels of Fe2+ in tea by PT spectrophotometry. TC-SLE was carried out in two continuous steps: Fe2+ can be completely extracted by PT-[BPy]PF6 or back-extracted at 80 °C and the two phases were separated automatically by cooling to room temperature. Fe2+, after back-extraction, needs 2 mol/L HNO3 as stripping agent and the whole process was determined by PT spectrophotometry at room temperature. The extracted species was neutral Fe(PT)mCl2 (m = 1) according to slope analysis in the Fe2+-[BPy]PF6-PT TC-SLE system. The calibration curve was Y = 0.20856X − 0.000775 (correlation coefficient = 0.99991). The linear calibration range was 0.10–4.50 μg/mL and the limit of detection for Fe2+ is 7.0 × 10−2 μg/mL. In this method, the contents of Fe2+ in Tieguanyin tea were determined with RSDs (n = 5) 3.05% and recoveries in range of 90.6%–108.6%. View Full-Text
Keywords: determination of Fe2+; tea; temperature controlling solid-liquid separation; ionic liquid as solid solvent determination of Fe2+; tea; temperature controlling solid-liquid separation; ionic liquid as solid solvent
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Pan, Z.; Wang, Z.; Zhu, L.; Zhu, Z.; Cai, J.; Shen, X.; Fan, T.; Zhang, Y.; Chen, Z. Development of an Analytical Method Based on Temperature Controlled Solid-Liquid Extraction Using an Ionic Liquid as Solid Solvent. Molecules 2015, 20, 22137-22145.

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