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GC-MS

QuestionAnswer
methods for sample intro: 1. Batch lnlet 2. Direct Probe 3. Chromatograph- Gc C & LC 4. Plasmas- ICP& MIP
interfacing GC to a MS depends on the type of column that is being used
What is necessary to do if megaprobe or a standard packed column is used and how it is accomplished? remove the bulk of the mobile phase b4 introducing the analyte into MS. accomplished bu using "jet separator"
Methods of ionization in ionization chamber 1. Gas-phase sources: sample is vaporized and then ionized. Used for thermally-stable species 2. Desorption sources: sample (liquid or solid) . used for non-volatile and thermally unstable species
Several methods for ionization: 1. Electron-impact source(El) 2. Chemical lionization source(Cl) 3. Field lonization source(F l) 4. Desorption sources
Electron-impact source(El) advantages: convenient to use; good sensitivity; good sensitivity; extensive fragmentation. Disadvantages: no molecular ion. limited sample : Molecular mass and boiling point
Mass analyzer: 1. Magnetic sector 2.double focusing 3. Time-of-flight 4.Quadrupole.
detectors: 1. Faraday Cup 2. Electron Multiplier 3.Photographic Plate 4. Scintillation-type
types of electron multiplier 1.discrete dynode type 2.continuous dynode type
Does path depend on the kinetic energy or angular momentum of ions in quadruple mass ionizer? NO- highr throuput of ions
Created by: K@t
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