title: Simultaneous derivatization and air-assisted liquid-liquid microextraction of some aliphatic amines in different aqueous samples followed by gas chromatography-flame ionization detection.
abstract: The paper presents a new method based on simultaneous derivatization and air-assisted liquid-liquid microextraction (AALLME) for the extraction and preconcentration of some aliphatic amines prior to gas chromatography-flame ionization detection (GC-FID). Primary aliphatic amines are derivatized and extracted simultaneously by a fast reaction with butylchloroformate (derivatization agent/extraction solvent) under mild conditions. The mixture of butylchloroformate and aqueous sample solution is rapidly sucked into a 10-mL glass syringe and then is injected into a test tube with conical bottom and the procedure is repeated seven times. After centrifuging the resulted cloudy solution, the derivatized analytes in the sedimented phase are determined by GC-FID. The influence of main factors on the efficiency of derivatization/extraction procedure is studied. Under the optimal conditions, the enrichment factors (EFs) for aliphatic amines are obtained in the range of 248-360 and limits of detection (LODs) are between 0.30 and 2.6 μg L(-1). The obtained extraction recoveries ranged from 50 to 72% and the relative standard deviation (RSD) was less than 4.8% for intra-day (n=6) and inter-days (n=4) precision. The method is successfully applied to determine some aliphatic amines in environmental water samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran. mafarajzadeh@yahoo.com
authors.forename: Mir Ali
authors.initials: MA
authors.lastname: Farajzadeh
authors.forename: Nina
authors.initials: N
authors.lastname: Nouri
mesh_terms: D000388:Air; D000588:Amines / Q000737:chemistry* / Q000302:isolation & purification; D002849:Chromatography, Gas; D005561:Formates / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D059627:Liquid Phase Microextraction; D012492:Salts / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D000588:Amines; D005561:Formates; D007477:Ions; D012492:Salts; D014867:Water; C083354:chlorocarbonic acid