Other Instrumental Methods in Environmental Analysis - Fundamentals of Environmental Sampling and Analysis - page 317

Figure 12.5 Schematic diagram of an atmospheric pressure electrospray ion (APEI) source used in
LC-MS ( # Agilent Technologies, Inc., 2005, Reproduced with permission, Courtesy of Agilent
Technologies Inc.)
and slightly polar compounds. The APCI method is analogous to CI (commonly
used in GC-MS) where primary ions are produced by corona discharge on a
solvent spray. In APCI (Fig. 12.6), the LC eluent is sprayed through a heated
(typically 250-400 C) vaporizer at atmospheric pressure. The heat vaporizes the
Figure 12.6 Schematic diagram of an atmospheric-pressure chemical ionization (APCI) used in
LC-MS ( # Agilent Technologies, Inc., 2005, Reproduced with permission, Courtesy of Agilent
Technologies Inc.)