期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1216, 期 5, 页码 756-762出版社
ELSEVIER
DOI: 10.1016/j.chroma.2008.11.094
关键词
Hollow-fiber-based liquid-phase; microextraction; Aromatic amines; High performance liquid chromatography
资金
- High-Tech Research and Development Program of China [2007AA06A407, 2007AA06Z413]
- National Natural Science Foundation of China [20621703]
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 mu 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 Na2SO4; organic phase: di-n-hexyl with 8% trioctylphosphine oxide (TOPO); AP: 10 mu L of 8 M HCl; extraction time of 80 min), the obtained EFs were 405-2000, dynamic linear ranges were 5-200 mu g/L (R > 0.9976). and limits of detection were 0.5-1.5 mu g/L. The presence of humic acid (0-25 mg/L dissolved organic carbon) had no significant effect on the extraction efficiency. The proposed procedure worked very well for real environmental water samples with microgram per liter level of analytes, and good spike recoveries (80-103%) were obtained. (C) 2008 Elsevier B.V. All rights reserved.
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