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2803165 
Journal Article 
Multiplex gas chromatography with a hollow fiber membrane interface for determination of trace volatile organic compounds in aqueous samples 
Yang, MJ; Pawliszyn, J 
1993 
Yes 
Analytical Chemistry
ISSN: 0003-2700
EISSN: 1520-6882 
BIOSIS/93/28545 
65 
13 
1758-1763 
English 
WOS:A1993LJ38000022 
BIOSIS COPYRIGHT: BIOL ABS. A multiplex gas chromatographic technique was applied in conjunction with a hollow fiber membrane module to allow rapid routine analysis and long-term continuous monitoring of trace amounts of volatile organic compounds (VOCs) in aqueous samples. This solvent-free method of analysis substantially reduces the sample preparation time by eliminating the preconcentration step. Loss of VOCs was also minimized during the analytical process. The sensitivity of the analysis was greatly enhanced due to multiplex and throughput advantages. The hollow fiber extraction can be performed using two flow rate regimens. At low flow rates, quantitative extraction is ensured, hence the effects of temperature and matrix on recoveries are eliminated. For high flow rates, the sensitivity of the method is dramatically increased because of the increase in extraction rates. At the optimum flow rate, a detection limit of 4 mug, with a precision of and lt; 5% in relative standard deviation, was achi