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J Chromatogr A

Title:		Determination of volatile organic compounds in water using headspace knotted hollow fiber microextraction
Author(s):		Chen PS; Tseng YH; Chuang YL; Chen JH;
Address:		"Department and Graduate Institute of Forensic Medicine, National Taiwan University, Taipei 10002, Taiwan; Forensic and Clinical Toxicology Center, National Taiwan University College of Medicine and National Taiwan University Hospital, Taiwan. Electronic address: paishanchen@ntu.edu.tw. Department and Graduate Institute of Forensic Medicine, National Taiwan University, Taipei 10002, Taiwan. Department and Graduate Institute of Forensic Medicine, National Taiwan University, Taipei 10002, Taiwan; Forensic and Clinical Toxicology Center, National Taiwan University College of Medicine and National Taiwan University Hospital, Taiwan"
Journal Title:		J Chromatogr A
Year:		2015
Volume:		20150331
Issue:
Page Number:		41 - 47
DOI:		10.1016/j.chroma.2015.03.067
ISSN/ISBN:		1873-3778 (Electronic) 0021-9673 (Linking)
Abstract:		"An efficient and effective headspace microextraction technique named static headspace knotted hollow fiber microextraction (HS-K-HFME) has been developed for the determination of volatile organic compounds (VOCs) in water samples. The knot-shaped hollow fiber is filled with 25muL of the extraction solvent. The excess solvent forms a large droplet (13muL) and is held in the center of the knot. Even after 20min of extraction time at high temperature (95 degrees C) without cooling, there was still enough volume of extraction solvent for gas chromatography-mass spectrometry (GC-MS) analysis, which extends the choice of solvents for headspace LPME. Moreover, the knot-shaped fiber has a larger extraction contact interface, which increases the rate of mass transfer between the headspace and extraction solvent film attached to the fiber, thus improving the extraction efficiency. The effects of extraction solvent, temperature, stirring rate, salt concentration and extraction time on extraction performance were optimized. The calibration curves exhibited coefficients of determination (R(2)) ranging from 0.9957 to 0.9999 and the limit of detection (LOD) ranged from 0.2 to 10mugL(-1). Relative standard deviations (RSDs) ranged from 4.5% to 11.6% for intraday measurements (n=5). Interday (n=15) values were between 2.2% and 12.9%. The relative recoveries (RRs) ranged from 90.3% to 106.0% for river water and 95.9% to 103.6% for wastewater"
Keywords:		Environmental Monitoring/*methods Gas Chromatography-Mass Spectrometry Limit of Detection Liquid Phase Microextraction/instrumentation/*methods Salts/chemistry Solvents/chemistry Temperature Volatile Organic Compounds/*analysis Water/*chemistry Headspace;
Notes:		"MedlineChen, Pai-Shan Tseng, Yu-Hsiang Chuang, Yuh-Lin Chen, Jung-Hsuan eng Netherlands 2015/04/13 J Chromatogr A. 2015 May 22; 1395:41-7. doi: 10.1016/j.chroma.2015.03.067. Epub 2015 Mar 31"