sufficiently selective for compound identification. ' ' ' Variable wavelength diode array detection (DAD) is preferable since the UV spectrum of a PAH can serve as a fingerprint indicating its identity.105,185 To improve on the selectivity of DAD, second-order bilinear calibration was applied to the analysis of coeluted peaks from an HPLC separation of PAHs and Sulfonated PAHs (SPAHs).264 The Generalized Rank Annihilation Method (GRAM) requires two data matrices, calibration data from spiked samples to minimize matrix effects and the unknown data. The method was applied to spiked marine sediments with reasonable success, although no analytes were detected in unspiked samples.

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