trobleshooting gas chromatography (gc)

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

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