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Gęca, Mateusz
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article
Capillary Sensors with UV-Forced Degradation and Fluorescence Reading of Chemical Stability and Polycyclic Aromatic Hydrocarbons Presence in Diesel Fuels
Abstract
There aremany standards and types oflaboratoryequipment for examination of specific properties of diesel fuels.The basic standards of diesel fuel stability require examinationtaking a relatively long time, counted in days. The developmentofnewmethodsofdieselfuelstabilitytestinghasasitsaimaccelerated ageing of the examined samples. The most popularofacceleratedageingfactorsaretheincreaseoftemperatureandoxidation.Inthispaperanewmethodwithdieselfuelsample positioned in a capillary and ultraviolet radiation usedas degradation factor is proposed. Two possible optical sensorconfigurationsaredescribedaswellasthedataanalysismethod for classification of premium and standard commercialdieselsamples.Thecomparisonoftwosensorconfigurationswasmadewiththesamefuelsampleswhichincludedwinterand summer premium diesel fuelas well aseco winterdieselfuel, unmodified and modified with sludge protection additive.Theresultsofsensoranalysisduringfuelexaminationprovethat 40 minutes of UV degradation and sequential fluorescencereadingat10selectedmomentsoftimecoupledwithdataprocessing is enough to evaluatediesel fuel chemical stabilityandquality.Intheexperimentslightof265nmand365nmwavelengthswasusedcorrespondinglyfordegradationandfluorescence reading. We found that chemical stability of fuelswasrelatedtotheamplitudevariationsofcharacteristicemittedfluorescencesignals.Theconcentrationofpolycyclicaromatic hydrocarbons in fuels was related to the amplitude ofsignalsemittedfromexcitedsamples.TheUVexaminationindicatedthatfuel’schemicalstabilitywasbetterobservablewith forced degradation and excitation at 265nm, while fuel’spolycyclicaromatichydrocarbonspresencewasbetterobservable with excitation at 365nm.