Abstract
A method is presented for the separation and substance-specific determination of chlorinated phenols at trace level in surface waters using capillary-GC/FTIR-spectroscopy. Since an injected amount of at least 100 ng is required to obtain well-structured IR spectra, the extraction and enrichment procedure must provide a concentration factor of 104 and simultaneously high recoveries. The separation of the complete range of chlorinated phenols is performed without derivatisation on a SE54 fused silica WCOT column; the degree of decrease in separation efficiency introduced by the FTIRS detection system is discussed. The applicability of an on-column injection technique using a thermodesorption- and cold trap injector with solvent removal is tested, which allows the injection of large volums of concentrate. Proceeding form 1 l water volume and a 10 ppb concentration level the chlorophenols are correctly identified by their IR spectra and the mean recovery is in the 90% range. Furthermore, the possibility is discussed to obtain information on the identity of matrix components based on IR data only.
Published Version
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