| abstract |
A multiple sample introduction mass spectrometer apparatus (1) having atmospheric pressure ion sources (3, 4, 6, 7) interfaced to mass analyzers (21) for introducing samples through multiple electrospray (ES) and atmospheric pressure chemical ionization (APCI) probes (3, 4, 6, 7). The mass spectra containing internal calibration peaks can be achieved by spraying different solutions simultaneously from the multiple inlet probes (3, 4, 6, 7). The electrospray (ES) and atmospheric pressure chemical ionization (APCI) probes (3, 4, 6, 7) are arranged in one atmospheric pressure ionization chamber (20) and can be switched on or off during an analytical run. |