Transcription of GC Large Volume Injection Optimization - US EPA
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GC Large Volume Injection Optimization - US EPA
Large Volume InjectionPresented ByTim AndersonGC Product ManagerPhenomenexEPA Region 6 QA ConferenceOctober, 2015 GoalDevelop a method to use the least amount of sample and achieve the highest possible s/n response2 Typical L Splitless500 g soilS/N = 25 Larger L Splitless500 g soilS/N = 125 Larger Injection / Smaller L Splitless100 g soilS/N = 25 What to Watch Out For! L Dichloromethane @ 250 C & 14 psi = 336 LLiner Volume 990 L = 1008 L; exceeds liner Volume ! Flashback Ghost peaks Loss in sensitivity / linearity3 PreliminaryAssumptions Pressure Pulsed Injection tend to improve analyte responses Improves transfer of analytes from the inlet into the column Started with Pressure Pulse and tested this assumption during throughout the experimentAnalytes: Started with a relatively simple list of Polycyclic
T im e - - > A b u n d a n c e T I C : L V I 0 0 3 . D T I C : 0 5 1 1 1 2 - M 0 1 . D T I C : L V I 0 0 4 . D T I C : L V I 0 0 6 . D Later Eluting PAH’s Pulsed Splitless for 0.6 min ... GC Large Volume Injection …
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