Determination of polycyclic aromatic sulfur heterocycles (PASH) in diesel fuel by high performance liquid chromatography and photodiode‐array detection

Abstract

SummaryAn oxidation method (sulfone method) for the determination of polycyclic aromatic sulfur heterocycles (PASH) in diesel fuel is presented. The aromatic fraction of a diesel fuel, isolated by solid phase extraction, is oxidized under controlled conditions with hydrogen peroxide.The oxidation products, mainly methylated dibenzosulfone, are determined and quantified directly, without further clean-up, by HPLC with photodiode-array detection.

Improvement of color purity in blue-emitting polyfluorene by copolymerization with dibenzothiophene

“…9 Dibenzothiophene has been reported to be the most abundant compound in gas oil. 10 Because the sulfur in dibenzothiophene can be easily converted to sulfoxide, 11 sulfone, 12 and sulfonium derivatives, 13 polymers containing dibenzothiophene moieties should be interesting in that they may similarly be converted to various functional polymers. To the best of knowledge, there has not been any report on the DBTh-based polymer up to now.…”

Visible light-induced desulfurization technique for light oil

“…These findings suggest that DCA is the most suitable photosensitizer for the photooxygenation of DBT, which seems to proceed via the three steps shown schematically in Fig. 12 Thus the process has potential for the desulfurization of light oil.…”

Class Separation of the Trace Polar Species Present in Diesel Using Hydrophilic Interaction Chromatography and High Resolution Mass Spectrometry

“…The literature indicates that reverse phase HPLC has been used for the analysis of diesel, jet fuel, and crude-oil, but group-type separations are most often achieved with normal phase liquid chromatography. , Standard methods, i.e., IP 391, EN-12916, and ASTM D 6591, are available for the group-type separation (based on the number of aromatic rings) of diesel with normal phase HPLC combined with refractive index detection. , Polar silica, aminosilane, or dinitroanilinopropyl-based stationary phases are employed, together with nonpolar solvents (e.g., dichloromethane and hexane) as the mobile phase. The mobile phases employed in normal phase HPLC present two important disadvantages: (i) in terms of health, safety, and environmental impact, these chemicals are classified as “hazardous”, and (ii) ionization suppression is a common phenomenon when normal phase HPLC is hyphenated with electrospray ionization (ESI-MS), and several strategies have been developed to deal with this challenge …”