Download - TROBLESHOOTING GAS CHROMATOGRAPHY (GC)
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TROBLESHOOTING GAS CHROMATOGRAPHY (GC)
Parto Zist Behboud
Reza Daj8/16/2014
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Today’s Overview •Introduction1•Troubleshooting Approach2•Pressure Problems3•Leaks4•Component Malfunctions5•Baseline Problems6
•Peak Problems7
•Data Problems8
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IntroductionFlow
Controller
Injection Port Detector
Column Oven
Column
Gas C
ylind
er
Electric Signal
Data P
rocessor
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TROUBLESHOOTING APPROACH
Do It Yourself
Reference Points
Common Problems
SafetyGetting the
FactsIsolating
the SourceRepair
StrategyPreventive
Maintenance
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•Split/Splitless1
•On-column Injection2
•Programed Temperature Vaporization3
Sample Injector System
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Detector
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Carrier GasHe and N2 are usually used.(In the case of a capillary column, helium is desirable) The gas of 99.999% or more of purity is used.Detector Gas TCD ... No need FID ... H2, Air ECD ... N2(In the case of a packed column, carrier gas is surely N2.
In the case of a capillary column, N2 is used for makeup gas. )
FTD ... H2, Air FPD ... H2, Air BID ... He
Carrier Gas and Detector Gas
Carrier Gas and Detector Gas
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Pressure Problems
Pressure Problems
High Pressure
Low Pressure
Erratic or Cycling Pressure
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Leaks
LeaksLocation the source
Piping
Column Fitting Leaks
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Component Malfunctions
Component
Malfunctions
Electronic Problems
Injector Problems
Column Problems
Temperature Problem
Detector Problems
Flow Problem
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BASELINE PROBLEMSNoisy Baselines1. AFC 2. Gradient Temperature3. Detector4. Recorder5. Data System
Drifting or Cycling Baseline1. Equilibration2. Late Peaks3. Temperature4. Electrical
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PEAK PROBLEMS
•No Peak or Small Peaks1•Bad Peak Shape2•Extra Peak3•Negative Peak4•Incorrect Retention Time5•Poor Resolution6