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Capillary electrophoresis coupled to mass spectrometry (CE–MS) was used for the analysis of naphthenic acid fraction compounds (NAFCs) of oil sands process-affected water (OSPW). A standard mixture of amine-derivatized naphthenic acids is injected directly onto the CE column and analyzed by CE–MS in less than 15min. Time of flight MS analysis (TOFMS), optimized for high molecular weight ions, showed...