Abstract
A simple, fast, and convenient dynamic headspace method for the analysis of trihalomethanes (THMs) in flowing water is described. A portable gas chromatograph with an on-line preconcentrator and an electron-capture detector is used with a glass sparger. Distilled water spiked with mixed concentrations of THMs is allowed to flow into the sparger, and the headspace is preconcentrated to a trap, desorbed, and analyzed by gas chromatography. The linear working concentration ranges are 0.1-25 ppb for dichlorobromomethane (DCBM) and dibromochloromethane (DBCM), 0.1-200 ppb for bromoform (BF), and 3-175 ppb for chloroform (CF). The relative standard deviation of peak areas obtained ranges from 4.4 to 8.4% for CF, 2.6 to 5.7% for DCBM, 2.4 to 6.0% for DBCM, and 5.8 to 9.4% for BF. Recoveries of tap water spiked with THM samples are estimated to be in the range of 92.8-131.1 % for CF (5-15 ppb), 79.5-166% for DCBM (0.5-2.0 ppb), 94.1-107.5% for DBCM (1.0-3.0 ppb), and 77.2-118.0% for BF (5-20 ppb). The limits of detection are 0.01 ppb for DCBM, DBCM, and BF and 0.10 ppb for CF. The addition of salt (Na 2 SO 4 ) to the water increases the chromatographic response of THMs
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