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Description of diesel fuel based on synchronous fluorescence spectroscopy

Baszanowska E., Otremba Z.

Journal of KONES

2017

Vol. 24, No. 1

39--45

The purpose of the study is spectrally characterise fuel Diesel used in diesel ship engine. For description of Diesel fuel the techniques of total synchronous fluorescence spectroscopy was applied. To characterise the oil, the spectrofluorometer ‘Aqualog Horiba’, which allows performing precise measurement in a short time, was applied to measure the excitation-emission spectra. Total synchronous fluorescence spectra of oil were obtained using various wavelength intervals basing on the measured excitation-emission spectra of Diesel fuel. Total synchronous spectra of Diesel oil are considered for several oil concentration. Synchronous fluorescence spectra were used to describe the detected maxima of Diesel fuel fluorescence by the wavelength-interval fluorescence maximum, containing information about the excitation wavelength and the wavelength-interval describing the characteristic fluorescence peak position for each considered fuel sample. That approach is discussed in relation to find a universal indicator – the wavelength-interval – as a possible tool proposed to Diesel fuel description independent from the fuel concentration. Therefore, we discuss the changes of the total synchronous fluorescence spectra for different oil concentration. Obtained results indicate that the best indicator for this kind of oil characterisation seems to be the wavelength-interval for 60 nm due to the independence of the synchronous spectra from the oil concentration.

Sectrofluorometric characterisation of the lubricate oil

Baszanowska E., Otremba Z.

Journal of Polish CIMAC

2014

Vol. 9, no 2

17--22

Exploitive features of lubricate oils are externalised by various physical and chemical parameters (for example temperature dependencies of density and viscosity, ignition point or water content). On the other hand it is well-known that fluorescence spectra of various types of crude oils and their derivatives are strongly differ from each other. It is reasonable thesis, that exploitive features of oil may be related to transformations of light inside the oil. Therefore, despite of that fact light transformations strongly depend on chemical composition of oil (especially from the content of cyclic and polycyclic molecules). No one can exclude, that physical conditions are for fluorescence processes closely related to changes of physical and chemical properties of oil (and consequently to exploitive features) as well as to newly arising compounds and intrusions (for example metals, caused by contact with various engine elements). The paper presents spectra of fluorescence of exemplary lubricate oil (Marinol) in various configurations, namely: emission spectrum for individual excitation wavelength, excitation spectrum for single emission wavelength, excitation-emission spectrum, synchronous fluorescence spectroscopy and total synchronous fluorescence spectroscopy. Dynamic structures of those spectra gives reason to conclude that shapes of fluorescence spectra may be controlled by exploitive features of oils.