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(a) The MPT mass spectrum of lanthanum collected on the MPT-LTQ-MS in positive mode. A 10 mg/L lanthanum standard solution was used. (b) MSn mass spectra of the precursor ions m/z 317, n up to 6. The subprecursor ions series are 317 → 299 → 281 → 263 → 233 → 155, corresponding to the dissociation fragment series H2O, H2O, H2O, NO, and NO4. (c) The MPT mass spectrum of La collected on a MPT quadrupole mass filer mass spectrometer.
