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Configuring the GC/MS System for Pesticide Analysis Table 5. PTV Injector - QC Sample Parameters Compound Setting Endrin Parameter QA/QC check: The breakdown products Endrin-aldehyde and Endrin-ketone must be < 20% of Endrin peak area. If > 20%, maintenance is recommended. Table 6. PTV Injector - Solvent Parameters Setting Solvents Cyclo-hexane/Acetone 9:1 Parameter • Beware of polar solvents that moisten the column film. • Do not use 100% acetone. • Acetonitrile (ACN) is not suitable for GC injection (only LC) because it strips the deactivation and damages the column film. • With QuEChERS sample preparation, solvent exchange is necessary, so small amounts of ACN in a suitable solvent are acceptable. • Alternative solvents are ethylacetate and ethylacetate/cyclohexane at 1:1 mix (or Ethyl Acetate/Cyclohexane 1:1) Thermo Scientific Pesticide Analyzer Reference 33
Configuring the GC/MS System for Pesticide Analysis Table 7. PTV Injector - Carrier Flow Parameters Setting Mode Carrier Gas Initial Flow Initial Time Surge Pressure Surge Time Ramp Rate Programmed Flow He 5.0 Purity 1.2 mL/min 30.0 min 220 kPa 2 min 2.0 mL/min to 3.0 mL/min Parameter Hold Time A ramped flow is important for quick analysis and peak shape. 7.2 min 34 Pesticide Analyzer Reference Thermo Scientific
Page 1 and 2: Pesticide Analyzer Reference
Page 3 and 4: © 2009 Thermo Fisher Scientific In
Page 5 and 6: Contents 4 Pesticide Analyzer Refer
Page 7 and 8: Introduction Modern analytical meth
Page 9 and 10: About This Manual This manual also
Page 11 and 12: What is a Pesticide? Pesticide Chem
Page 13 and 14: What is a Pesticide? Table 2. Pesti
Page 23 and 24: Preparing Samples Preparing Samples
Page 25 and 26: Preparing Samples Extracting Sample
Page 27 and 28: Preparing Samples 5. Place the tube
Page 29 and 30: Preparing Samples Exchanging Solven
Page 31 and 32: Preparing Samples 5. Centrifuge the
Page 33 and 34: Setting Up a Method 9. Now you can
Page 35 and 36: Configuring the GC/MS System for Pe
Page 37: Configuring the GC/MS System for Pe
Page 53 and 54: List of Pesticide Compounds Table 2
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List of Pesticide Compounds Table 2
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SRM Method Library Table 27. Compou
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References References 1. Anastassia
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