Patent ID: 7355172
Filing Date: 2008-04-08
Classification: G01N,H01J

Abstract:
1. A liquid chromatography/mass spectrometry apparatus, which combines a liquid chromatograph having a liquid delivery part for performing gradient delivery with mixed multiple solvents, and a mass spectrometry device having an ionization part for spraying and ionizing in a roughly atmospheric-pressure atmosphere a liquid sample separated into components by said liquid chromatograph, said apparatus comprising: storing means for storing a corresponding relationship between a mixture ratio of said multiple solvents in said liquid delivery part and a substantially optimal voltage applied to said ionization part; ratio information acquiring means for computing said mixture ratio of multiple solvents in said liquid delivery part over passage of time during analysis of said sample; voltage value computing means for computing said substantially optimal voltage at any point in time during said analysis based on said mixture ratio obtained by said ratio information acquiring means while referring to information stored in said storing means; and voltage controlling means for changing said voltage applied to said ionization part over the passage of time in accordance with a computed result from said voltage value computing means.