Abstract Changing response is often caused by injector activity towards the components of interest. Some pesticides are thermo-sensitive and may show (partial) degradation in the injector.
Liner activity may cause adsorbtion in the liner which has a critical effect on reproducibility of the analysis.
LevelBasic
Common problems in pesticide analysis are:
- Thermal degradation and decomposition. Causes:
- High Temperatures in injector and column;
- Residence time;
- Mainly injector related.
- Adsorption/Catalytic processes. Causes:
- Liner activity, deactivation;
- Glasswool activity
Again mainly Injector related. - Matrix effects:
- Deactivation of GC system by coextracts, waxes, colorants.
- Creation of active sites, catalytic processes.
- Both Injector/column related.
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