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Ultra-performance liquid chromatography ion mobility time-of-flight mass spectrometry (UPLC-IM-TOFMS) was utilized for the analysis of naphthenic acids (NAs) in fractions of pH-dependent sequential liquid-liquid extractions from oil sands process-affected water. Ion-mobility separation technique allowed the differentiation of OyS−NAs (2 ≤ y ≤ 4) from Ox−NAs (2 ≤ x ≤ 5) via drift time versus retention...
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