Journal
CHROMATOGRAPHIA
Volume 61, Issue 1-2, Pages 75-80Publisher
SPRINGER HEIDELBERG
DOI: 10.1365/s10337-004-0467-6
Keywords
gas chromatography; solid phase microextraction; calix[4]arene-coated fiber; aromatic amines; wastewater samples
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Detection of aromatic amines without derivatization was carried out using a new solid-phase microextraction fiber coated with 25,27-dihydroxy-26,28-(1',10'-dioxo-4',7'-diaza-3',8'-dioxooctamethylene)-p-tert-butylcalix[4]arene (amide bridged-C[4]). The new fiber shows excellent selectivity and sensitivity for the tested amines (aniline, o-toluidine, 2,4-dimethylaniline, 3,4-dimethylaniline, N-ethyl-m-toluidine, and N,N-diethylaniline). The coating has high thermal stability (up to 380 degreesC) and solvent stability. Experimental conditions, such as extraction temperature and time, pH and ionic strength were optimized. The method proposed here shows good linearity and low detection limits ranged from 1.2 to 40 ng.L-1. Application of this method was demonstrated through the determination of aromatic amines in wastewater from a pharmaceutical plant.
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