Capillary Sensors with UV-Forced Degradation and Fluorescence Reading of Chemical Stability and Polycyclic Aromatic Hydrocarbons Presence in Diesel Fuels

- There are many standards and types of laboratory equipment for examination of specific properties of diesel fuels. The basic standards of diesel fuel stability require examination taking a relatively long time, counted in days. The development of new methods of diesel fuel stability testing has as its aim accelerated ageing of the examined samples. The most popular of accelerated ageing factors are the increase of temperature and oxidation. In this paper a new method with diesel fuel sample positioned in a capillary and ultraviolet radiation used as degradation factor is proposed. Two possible optical sensor configurations are described as well as the data analysis method for classification of premium and standard commercial diesel samples. The comparison of two sensor configurations was made with the same fuel samples which included winter and summer premium diesel fuel as well as eco winter diesel fuel, unmodified and modified with sludge protection additive. The results of sensor analysis during fuel examination prove that 40 minutes of UV degradation and sequential fluorescence reading at 10 selected moments of time coupled with data processing is enough to evaluate diesel fuel chemical stability and quality. In the experiments light of 265nm and 365nm wavelengths was used correspondingly for degradation and fluorescence reading. We found that chemical stability of fuels was related to the amplitude variations of characteristic emitted fluorescence signals. The concentration of polycyclic aromatic hydrocarbons in fuels was related to the amplitude of signals emitted from excited samples. The UV examination indicated that fuel’s chemical stability was better observable with forced degradation and excitation at 265nm, while fuel’s polycyclic aromatic hydrocarbons presence was better observable with excitation at 365nm.

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