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This gas chromatographic method is for determining trace amounts of p-diethylbenzene (p-DEB) or trace amounts of indan as impurities in C8 and lower boiling aromatic streams. High levels of other C9 or C10 aromatics may interfere with the determination of trace p-DEB and indan in C8 aromatics. The method can also be used for determining trace amounts of C8 aromatics in p-DEB. The C8 aromatic isomers are resolved and determined individually. The lower limit of quantitation for p-DEB or indane is 0.5 mass-ppm and for each xylene isomer it is 2 mass-ppm.