trobleshooting gas chromatography (gc)
DESCRIPTION
TROBLESHOOTING GAS CHROMATOGRAPHY (GC). Parto Zist Behboud Reza Daj 8/16/2014. Today’s Overview. Introduction. Injection Port. Flow Controller. Detector. Data Processor. Electric Signal. Column Oven. Gas Cylinder. Column. Troubleshooting Approach. Sample Injector System. - PowerPoint PPT PresentationTRANSCRIPT
TROBLESHOOTING GAS CHROMATOGRAPHY (GC)
Parto Zist Behboud
Reza Daj8/16/2014
Today’s Overview •Introduction1•Troubleshooting Approach2•Pressure Problems3•Leaks4•Component Malfunctions5•Baseline Problems6
•Peak Problems7
•Data Problems8
IntroductionFlow
Controller
Injection Port Detector
Column Oven
Column
Gas C
ylind
er
Electric Signal
Data P
rocessor
TROUBLESHOOTING APPROACH
Do It Yourself
Reference Points
Common Problems
SafetyGetting the
FactsIsolating
the SourceRepair
StrategyPreventive
Maintenance
•Split/Splitless1
•On-column Injection2
•Programed Temperature Vaporization3
Sample Injector System
Detector
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
Pressure Problems
Pressure Problems
High Pressure
Low Pressure
Erratic or Cycling Pressure
Leaks
LeaksLocation the source
Piping
Column Fitting Leaks
Component Malfunctions
Component
Malfunctions
Electronic Problems
Injector Problems
Column Problems
Temperature Problem
Detector Problems
Flow Problem
BASELINE PROBLEMSNoisy Baselines1. AFC 2. Gradient Temperature3. Detector4. Recorder5. Data System
Drifting or Cycling Baseline1. Equilibration2. Late Peaks3. Temperature4. Electrical
PEAK PROBLEMS
•No Peak or Small Peaks1•Bad Peak Shape2•Extra Peak3•Negative Peak4•Incorrect Retention Time5•Poor Resolution6
PARTO ZIST BEHBOUD
Web: www.Partoz.comContact: [email protected]: 88104115Fax: 88104117