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We present the selective ionization of acidic components of crude oils and naphthenates by negative-ion electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). We further characterize isolated naphthenic acids from a calcium napthenate deposit by negative-ion ESI tandem mass spectrometry (MS n ): collision-induced dissociation (CID) and infrared...
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