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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
School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.ORCID iD: 0000-0002-5729-1908
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
2009 (English)In: Journal of Chromatography A, ISSN 0021-9673, E-ISSN 1873-3778, Vol. 1216, no 5, 756-762 p.Article in journal (Refereed) Published
Abstract [en]

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 pKa (-4.25 to 4.6) and log KOW (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 microL 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 microL of 8 M HCl; extraction time of 80 min), the obtained EFs were 405-2000, dynamic linear ranges were 5-200 microg/L (R>0.9976), and limits of detection were 0.5-1.5 microg/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.

Place, publisher, year, edition, pages
Elsevier, 2009. Vol. 1216, no 5, 756-762 p.
Keyword [en]
Hollow-fiber-based liquid-phase microextraction, Aromatic amines, High performance liquid chromatography
National Category
Analytical Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-38468DOI: 10.1016/j.chroma.2008.11.094ISI: 000262797100001PubMedID: 19108841Scopus ID: 2-s2.0-58149197508OAI: oai:DiVA.org:oru-38468DiVA: diva2:764965
Note

Sponsors:

High-Tech Research and Development Program of China Grant(s): 2007AA06A407  2007AA06Z413 

National Natural Science Foundation of China Grant(s): 20621703 

Available from: 2014-11-21 Created: 2014-11-07 Last updated: 2017-10-17Bibliographically approved

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