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Huolinguole lignite was sequentially extracted with carbon disulfide, ethyl acetate, methanol and acetone. All of the extracts were analyzed using a time-of-flight-mass spectrometry (TOF-MS) equipped with an atmospheric pressure photoionization (APPI) ion source. Toluene or 1,4-difluorobenzene was chosen as dopant for APPI. The results indicated that both dopants could well ionize compounds which...
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