Patent ID: 6942793
Filing Date: 2005-09-13
Classification: G01N

Abstract:
1. A liquid chromatograph mass spectrometer comprising: a pump; a sample injector; a plurality of separation columns, including a first separation column and a second separation column; and mass spectrometer; wherein said liquid chromatograph mass spectrometer further comprises: a plurality of trap columns for retaining a sample component separated by said first separation column; a first switching valve for switching between one of said plurality of trap columns and another one of said plurality of trap columns at regular time intervals in such a way that when said one of said plurality of trap columns is connected to said first separation column, said another one of said plurality of trap columns is connected to said pump, and vice versa; and a second switching valve for, when a trap column is connected to said pump, further connecting said trap column to said second separation column after connecting said trap column to solution discharging means during a predetermined initial time period, said second separation column being connected to said mass spectrometer and capable of separating said sample component in a shorter time than said first separation column.