GC/MS tuning

GC-MS Tuning Standard for semivolatiles that contains the tuning compound decafluorotriphenylphosphine (DFTPP) and also 4,4 -DDT, pentachlorophenol, and benzidine. DFTPP is used to verify that the hardware tune was carried out previously and the other three analytes are used to verify injection port inertness and GC column performance. Polar compounds like phenols tend to adsorb to contaminated surfaces and result in the complete loss of response or poor peak shape. 

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