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Simultaneous Conduction of Two- and Three-phase Hollow-fiber-based Liquid-phase Microextraction for the Determination of Aromatic Amines in Environmental Water Samples by Yong Tao; Jing-Fu Liu; Thanh Wang; Gui-Bin Jiang is a Chemistry article available to read on EtoBox.
What is Simultaneous Conduction of Two- and Three-phase Hollow-fiber-based Liquid-phase Microextraction for the Determination of Aromatic Amines in Environmental Water Samples about?
This paper describes a simultaneously performed two-/three-phase hollow-fiber-based liquid-phase microextraction (HF-LPME) method for the determination of aromatic amines with a wide range of pK a (-4.25 to 4.6) and log K OW (0.9-2.8) values in environmental water samples. Analytes including aniline, 4-nitroaniline, 2,4-dinitroaniline and dicloran were extracted from basic aqueous samples (donor phase, DP) into the microliter volume of organic membrane phase impregnated into the pores of the polypropylene hollow fiber wall, then back extracted into the acidified aqueous solution (acceptor phase, AP) filling in the lumen of the hollow fiber. The mass transfer of the analytes from the donor phase through the organic membrane phase into acceptor phase was driven by both the counter-coupled transport of hydrogen ions and the pH gradient. Afterwards, the hollow fiber was eluted with 50 L methanol to capture the analytes from both the organic membrane and the acceptor phase. Factors relevant to the enrichment factors (EFs) were investigated. Under the optimized condition (DP: 100 mL of 0.1 M NaOH with 2 M Na 2 SO 4 ; organic phase: di-n-hexyl with 8% trioctylphosphine oxide (TOPO); AP: 1
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- Author
- Yong Tao; Jing-Fu Liu; Thanh Wang; Gui-Bin Jiang
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)
- Published
- 2009
- Language
- EN
- Field
- Chemistry (Physical Sciences)