Gas chromatographic determination of polychlorophenols after derivatization with monochloroacetic anhydride

摘要

A selective and highly selective procedure is presented for the determination of the systematic class of polychlorophenols (PCP) by gas chromatography with electron capture detection (ECD) upon derivatization with monochloroacetic anhydride. The relative intensity of the analytical signal (in comparison to simple acetates) is increased 8-9 times for dichlorophenols and 2.5-4 times for trichlorophenols; for tetra- and pentochlorophenols, the enhancement coefficient is 1.5-2. The stage of PCP derivatization is studied by GC/MS; the mass spectra of tri- and tetrachlorophenol monochloroacetates were recorded for the first time. The limits of determination were 0.005-0.016 μg/L (RSD 6-7%), and the upper limit of the detected concentrations was 0.050-0.160 μg/L (RSD 3-4%).