Multidimensional gas chromatography has been used to resolve specific chlorobiphenyl (CB) congeners in technical Aroclor samples. Coelution of key CB congeners results from single-column analysis of polychlorinated biphenyls (PCB). Therefore, two columns of different selectivity were necessary to enhance their resolution. Seven marker compounds, currently listed as indicators for PCB occurrence and distribution in the environment, were heartcut to a second column of different PCB selectivity. By adjusting the size of the heartcut window, it was possible to include the peaks of interest together with some coeluting components, whilst excluding other interferences. This effect aids full resolution of the marker congeners. The reproducibility, in terms of retention time, peak area and peak height of the heartcutting procedure, was evaluated for the seven marker-CB mixture. To reduce the analysis time to 60 min, an alternative method involving heartcutting with selective cryogenic modulation trapping was investigated using the seven marker-CB mixture and the technical sample Aroclor 1254.
|Number of pages||10|
|Journal||LC GC Europe|
|Publication status||Published - 1 Jan 1998|