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Continuous On‐Line Monitoring of Trihalomethanes in Chlorinated Drinking Water Using an Automated System Based on Pulse Introduction Membrane Extraction and High Speed Gas Chromatography/Mass Spectrometry
Author(s) -
Chang Cheng Chin,
Lu Pei Fen,
Her Guor Rong
Publication year - 2002
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200200130
Subject(s) - chemistry , chromatography , mass spectrometry , tap water , gas chromatography , trihalomethane , extraction (chemistry) , elution , analytical chemistry (journal) , gas chromatography–mass spectrometry , detection limit , chlorine , environmental engineering , environmental science , organic chemistry
An automated system based on pulse sample introduction membrane extraction and gas chromatography/mass spectrometry (GC/MS) has been developed for on‐line monitoring of Trihalomethanes (THMs) in chlorinated drinking water. Pulse samples were injected into the membrane through a sample loop. Zero air was used as the eluent to elute the water samples and also acted as the purging gas. The use of zero air as the purging gas facilitates the cleanup of the membrane to reduce the tailing part of sample input. Under typical operating conditions, the cycle time can be reduced to less than 4 min. The detection limits of this system were found to be about 50 ppt, 50 ppt, 50 ppt, and 20 ppt for CHCl 3 , CHBrCl 2 , CHBr 2 Cl, and CHBr 3 , respectively. The utility of this system was demonstrated with a ten‐hour on‐line monitoring of THMs in tap water.