Abstract
To measure the concentrations of trihalomethanes (THM's) in drinking water, a rapid and precise method was developed by solid‐phase microextraction (SPME) coupled with gas chromatography/ electron‐captured detection. No cryofocusing device is needed. A fused silica fiber coated with a 7 μm thick stationary phase of poly(dimethylsiloxane) was employed to extract THM's for ten minutes. The extracts are then fully desorbed in 3 minutes after injected in a GC injector. Oven temperature initiated at 35°C for 3 minutes are used for cryogenic focusing the THM's. All the four analytes‐ CHCl3, CHBrCl2, CHBr2Cl and CHBr3, are well separated and it takes only 12.5 minutes to complete the Chromatographic run. The method meets the requirement of the US EPA methods 624 for the analysis of chlorinated compounds. The major advantages of the method are absolutely eliminating the use of solvent and easily coupling between SPME and a GC instrument.
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