Measurement Of Non-Hindered And Hindered Phenolic Species In Aviation Fuels Via Tandem-Spe With Comprehensive Gc X Gc-Ms/Fid

Phenolic species have a great impact on the thermal oxidation stability of aviation fuels. However, it is difficult to measure phenolic complex composition and trace content. In this paper, a novel method based on tandem-solid phase extraction (SPE) with comprehensive two-dimensional gas chromatography (GC x GC)-mass spectrometry (MS) and flame ionization detector (FID) was proposed for measurement of phenolic species in aviation fuels. The tandem of normal phase SPE and anion exchange SPE was employed to extract non-hindered and hindered phenolic species respectively from aviation fuels, and comprehensive GC x GC-MS/FID was used to identify and quantify individual phenolic species with few co-elution. Ninety-eight kinds of phenolic species were identified manually in aviation fuels according to the characteristic m/z and phenolic distribution regular in the 2D chromatogram. Quantitative accuracy for phenolic species was verified as their recoveries were satisfactory, especially hindered phenols (BHT), which were totally deprotonated by 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD). Each phenolic species was individually quantified using calibration curve library. Moreover, this work analyzed the adsorption characteristics of phenolic isomers in tandem-SPE procedure and the variation of the contents of phenolic and other oxygenated species after thermal stress. This is an accurate and complete method for measurement of non-hindered and hindered phenolic species in aviation fuels, which is of great significance to establish and improve the kinetic model of thermal oxidation deposition.