Identification of Halogenated Compounds in Chlorinated Seawater and Drinking Water Produced Offshore Using n-Pentane Extraction and Open-Loop Stripping Technique.

The formation of byproducts in chlorinated seawater used for drinking water production on three oil installations was investigated with the use of n-pentane and open-loop stripping extraction. The use of capillary gas chromatography (GC) with electron capture detection (ECD) and mass spectrometry (MS) revealed the presence of a great variety of bromine-substituted aliphatic and aromatic compounds in both chlorinated seawater and tap water. Tribromomethane and dibromoacetonitrile were found in tap water in the range of 19-27 μg/L and 0.9-1.6 μg/L, respectively, and these major byproducts were most efficiently extracted with n-pentane